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- IMMEDIATE PROTECTION: Drops, spills, and cracked screens covered for portable products, plus power surge protection from day one. Malfunctions covered after the manufacturer’s warranty ends.
- EASY CLAIMS: File a claim in minutes at Asurion.com/amazon. We'll repair, replace, or reimburse you up to the purchase price (excluding tax).
- ELIGIBILITY: Plan must be purchased with your product or within 30 days of purchase. Pre-existing conditions are not covered. (Products for business or commercial use are excluded)
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Coverage for accidental damage including drops, spills, and broken parts, as well as breakdowns (plans vary) -
24/7 support when you need it -
Quick, easy, and frustration-free claims
Product Protection by Asurion, LLC
- NO ADDITIONAL COST: You pay no fees for repairs, replacements or reimbursements. Shipping included.
- IMMEDIATE PROTECTION: Drops, spills, and cracked screens covered for portable products, plus power surge protection from day one. Malfunctions covered after the manufacturer’s warranty ends.
- EASY CLAIMS: File a claim in minutes at Asurion.com/amazon. We'll repair, replace, or reimburse you up to the purchase price (excluding tax).
- ELIGIBILITY: Plan must be purchased with your product or within 30 days of purchase. Pre-existing conditions are not covered. (Products for business or commercial use are excluded)
- TERMS AND DETAILS: Terms & Conditions are emailed within 24 hours and available in Your Orders on Amazon. More information about this protection plan is available within the “Product guides and documents” section. Simply click “User Guide” for more info.
Product Protection by Asurion, LLC
- NO ADDITIONAL COST: You pay no fees for repairs, replacements or reimbursements. Shipping included.
- IMMEDIATE PROTECTION: Drops, spills, and cracked screens covered for portable products, plus power surge protection from day one. Malfunctions covered after the manufacturer’s warranty ends.
- EASY CLAIMS: File a claim in minutes at Asurion.com/amazon. We'll repair, replace, or reimburse you up to the purchase price (excluding tax).
- ELIGIBILITY: Plan must be purchased with your product or within 30 days of purchase. Pre-existing conditions are not covered. (Products for business or commercial use are excluded)
- TERMS AND DETAILS: Terms & Conditions are emailed within 24 hours and available in Your Orders on Amazon. More information about this protection plan is available within the “Product guides and documents” section. Simply click “User Guide” for more info.
Product Protection by Asurion, LLC
- BEST VALUE: Protect all your eligible Amazon purchases including: tech, tools, appliances, furniture and more. All for one low monthly price.
- PAST AND FUTURE PROTECTION: Covers malfunctions and failures, plus drops or spills for eligible portable items. Protection begins immediately for eligible purchases from the past 90 days, plus all eligible future purchases (products used commercially are excluded).
- TRUSTED CYBERSECURITY: Digital security with scam detection for emails and texts.
- EASY CLAIMS: File in minutes at www.asurion.com/amazon for fast repair or reimbursement - up to the purchase price.
- NO HIDDEN FEES. CANCEL ANYTIME: Up to $5,000 in total claims per 12-month period. Your plan renews monthly until canceled (coupons applied at checkout don’t renew monthly).
Product Protection by Asurion, LLC
- NO ADDITIONAL COST: You pay no fees for repairs, replacements or reimbursements. Shipping included.
- IMMEDIATE PROTECTION: Drops, spills, and cracked screens covered for portable products, plus power surge protection from day one. Malfunctions covered after the manufacturer’s warranty ends.
- EASY CLAIMS: File a claim in minutes at Asurion.com/amazon. We'll repair, replace, or reimburse you up to the purchase price (excluding tax).
- ELIGIBILITY: Plan must be purchased with your product or within 30 days of purchase. Pre-existing conditions are not covered. (Products for business or commercial use are excluded)
- TERMS AND DETAILS: Terms & Conditions are emailed within 24 hours and available in Your Orders on Amazon. More information about this protection plan is available within the “Product guides and documents” section. Simply click “User Guide” for more info.
MarCELL Cellular Temperature, Humidity & Power Monitor (Verizon) - Made in The USA - RVs, Pet Safety Monitoring, Second Home Monitoring, Greenhouse Monitoring,- 24/7 Monitoring & Instant Alerts
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Purchase options and add-ons
| Color | White |
| Brand | MarCELL |
| Item Weight | 0.6 Pounds |
| Battery Description | Lithium-Ion |
| Mounting Type | Tabletop |
About this item
- Best Value – MarCELL Subscription Plans for as low as $8.25/mo, nearly half of what our competitors charge. A MarCELL Subscription Plan is necessary since we operate on cellular networks.
- Cellular Advantage - MarCELL can be used anywhere there is a Cellular Signal and continues to operate in power outages, unlike Wifi Devices
- 24/7 Continuous Monitoring - Receive alerts via text, call or email when temperature and humidity levels reach critical levels, or power is lost
- Real Time Readings - Whenever you check the webpage or app the readings will update (15 minute refresh after first reading)
- Monitor From Anywhere - Use our intuitive app to view your readings at anytime, from anywhere. Review historic data and get instant updates on current environmental conditions
Additional Details
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Product description
MarCELL has a Sensor for Every Job
3-in-1 Monitor-Verizon
Add to Cart
| Pet Watch Bundle-Verizon
Add to Cart
| Home Watch Bundle-Verizon
Add to Cart
| PRO Sensor-AT&T Network
Add to Cart
| NIST-Certified Sensor
Add to Cart
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Customer Reviews
|
4.5 out of 5 stars 778
|
5.0 out of 5 stars 2
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3.7 out of 5 stars 4
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4.4 out of 5 stars 79
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5.0 out of 5 stars 1
|
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Price
| $119.95$119.95 | $124.95$124.95 | $149.95$149.95 | $199.00$199.00 | $279.00$279.00 |
|
Model
| Original 3-in-1 Sensor | Original+Car Mount & Cable | Original+2 Water Drip Senssors | Original+Precise Temp Sensor | Origial+Nist-Certified Sensor |
|
Recommended for
| General Use | RVs, Campers, Cars | RVs, Campers, Cars | Professional Level Remote Temp | NIST Temp Tracking & Logging |
|
Temperature Sensor
| ✔ | ✔ | ✔ | ✔ | ✔ |
|
Humidity Sensor
| ✔ | ✔ | ✔ | ✔ | ✔ |
|
Power Sensor
| ✔ | ✔ | ✔ | ✔ | ✔ |
|
sPuck Water Sensor
| ✘ | ✘ | ✔ | ✘ | ✘ |
|
Vehicle Plug + Mount Bracket
| ✘ | ✔ | ✘ | ✘ | ✘ |
|
PRO Temp Sensor for Business
| ✘ | ✘ | ✘ | ✔ | ✘ |
|
NIST Certified Temp Sensor
| ✘ | ✘ | ✘ | ✘ | ✔ |
Product guides and documents
Product information
| Battery Description | Lithium-Ion |
|---|---|
| Mounting Type | Tabletop |
| Operating Humidity | 10-90% |
| Upper Temperature Range | 90 Degrees Fahrenheit |
| Temperature Accuracy | +-1 degree Celsius |
| Temperature Reading Accuracy | plus_minus_0_point_5_degrees_celsius |
| Smart Home Compatibility | Smart Home Compatible |
| Item Weight | 0.6 Pounds |
|---|
| Color | White |
|---|
Feedback
| Brand Name | MarCELL |
|---|---|
| Manufacturer | Sensored Life |
| UPC | 733876000255 019962779930 |
| Warranty Description | 1 Year Limited Warranty |
| Global Trade Identification Number | 00733876000255 |
| Part Number | MAR-500A |
| Model | Home/RV |
| Unit Count | 249.0 Count |
| Item Type Name | Temperature Monitor |
| Item Length | 5.75 Inches |
| Included Components | Plug-in Transformer |
| Best Sellers Rank |
|
| ASIN | B00QRMFEAQ |
| Customer Reviews |
4.5 out of 5 stars |
Safety and product resources
Safety documents
What's in the box
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
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Top reviews from the United States
- 5 out of 5 stars
Works well so far. Just to clarify some of the negative reviews' points:
Reviewed in the United States on January 27, 2026Works great so far. Bought it to monitor a house remotely that I am the executor of until I can get it sold.
Just to clear up some information in the negative reviews:
Yes, it requires a subscription. It uses 4G cellular. That's not free. You can pay monthly or buy a season or year in advance and save some money. Monthly = $14.95/mo; Seasonal = $11.95/mo (for 4 to 8 months); Annual paid in advance = $8.25/mo
Why not wi-fi? Well when your power or internet goes out, so does your wi-fi. This device has 4G cellular and a battery backup so it works during internet and power outages. (Of course, yes 4G could go down in a hurricane, but you can't cover every scenario now can you!)
(From the FAQ on their website): The sensor checks temperature, humidity and power readings every 10 seconds. If a reading exceeds your set thresholds, you’ll receive an instant notification. You can get notified by email, text or by their app. I like the text option. It's where I'm most likely to see the warnings right away.
Live Viewing via their Website or App (Also from their FAQ): When you log in, readings refresh automatically, then update every 15 minutes while you’re active. The oldest data you will see on the web page or app will be 15 minutes old. For more frequent updates, you can purchase Instant Update bundles— $2 for 8 updates—to view the latest data anytime.
I personally don't think "real time" is necessary if I have access to the latest reading from within 15 minutes. That's good enough for me. And again, if there is a temperature/humidity/power issue detected, you will still get notified immediately by text, etc.
Minor cons:
I wish the unit had rubber feet on the bottom. It is hard plastic and can slide off the counter easily. I will add rubber feet myself. You can also mount it to the wall using the holes on the back of the unit. Or use Velcro I suppose. They also sell a mounting bracket on their web site. And they provide the 3D printing plans for it (nice touch.)
I initially had a problem getting a cellular signal until I moved the unit closer to a window. A rather normal issue with cellular service. Just noting it here.
Amazon shipped me an opened, returned device, but apparently it was unused. That doesn't affect my review. That's Amazon's fault. Luckily the device worked fine, as I needed it ASAP.
Overall though, very pleased with the device so far. If anything changes, I will update this review.
5 people found this helpfulSending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
Easy to use
Reviewed in the United States on March 7, 2026Affordable, easy to use and reliable! Thanks for a good product.
Sending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
Love it!
Reviewed in the United States on May 18, 2026Had this over the winter at my cabin in northern Minnesota. Worked perfect all winter. My heat went out once and it saved me from broken water pipes. It also told me when the power went out, and when it came back on a couple times. It's something I would not go without. Highly recommend!
One person found this helpfulSending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 4 out of 5 stars
Great, useful tool… but needs more frequent updating
Reviewed in the United States on February 15, 2022I bought this temperature monitor for my vacation cottage because our internet is spotty, so a wifi version is unreliable. Since we keep our cottage open all winter, it is crucial for us to keep track of the interior temps to make sure that the pipes don’t freeze. This unit is perfect for the job, since it not only runs on cell, but also has a battery backup. Recently, the temperatures in the area dropped to 17 below zero and the power was knocked out. We were able to keep a close eye on the interior temperatures of our house to make sure it never got below freezing. Fortunately the power was restored and the heat came back on, but if it had dropped too low, we would have been able to call a neighbor to get our generator going. So, the Marcell was really helpful.
The unit was easy to set up and connected right away. I jus followed the instructions and it was up and running in minutes.
The downside of this unit is that the reporting is only given every 6 to 8 hours or so. That means that in the event of an emergency, you might not know there is an issue or be able to see the trends until you trigger temp is hit and you get a text. During the outage, I ended up paying extra money to be able to get realtime data. It would be great if we could get hourly data like some of the competitor products.
24 people found this helpfulSending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
MarCELL Sensor
Reviewed in the United States on May 13, 2026The sensor works perfectly. The vendor's description, and the many reviews, accurately conveyed the device's features and performance. It's very reasonably priced and was delivered quickly. Very satisfied.
Sending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
Great product. At first I was a bit disturbed ...But after 6 months use, I am no longer. FANTASTIC
Reviewed in the United States on December 2, 2017Great product. At first I was a bit disturbed that the reporting isn't done in livetime--but in practice it's no big matter at all. If one of the values (temperature, humidity, power status) does go out of your own pre-established range, you get an immediate call or text message informing you of the same. Wonderful and comforting device and system giving me lots of peace of mind. Get it!
Update 3/16/2018: I am always a bit suspicious of reviewers who review a purchased product a week after buying it. So let me update my original reivew from about 6 months ago and say: I wouldn't change a word. This is a great product and over this very snowy and very cold winter up here in New York State it has given me enormous peace of mind, day in and day out, living far from my blessed country home in rural New York. Occasionally I get a call from the monitor to tell me that power is out (and it IS!) and then, usually, another call a few minutes later to inform me it has been restored. If power is out for any length of time, I can send someone over who is closer to my home to investigate. If you live in a climate where 'climate' is increasingly becoming an issue--this is a cheap and fantastic method of monitoring a remote location. Again--get it, get it, get it. This is pure genius, so simple in conception and execution. Everybody who has a residence subject to the vagaries of climate deserves this device in their home.
79 people found this helpfulSending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
Great purchase
Reviewed in the United States on January 16, 2026Great product. I can monitor my cabin and have peace of mind nothing will freeze up. Very easy to setup and the monthly cost is minimal.
Sending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 3 out of 5 stars
Reliable cellular based monitoring
Reviewed in the United States on September 23, 2022I monitor the power and temperature of both my home and boat all winter. The subscription price is reasonable and uses a cellular modem to monitor temperature, humidity and power availability. If outside any of the adjustable settings I get a text alert. The app for my phone is easy to use and allows adjustments to the set points for notifications. History tracking and real-time readings are also available.
Simple simple simple…. Plug in the monitor and it connects the cellular modem and starts to report as soon as you register your device. It’s perfect for monitoring our summer house and boat while we are away for the winter.
3 people found this helpfulSending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again
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Product Summary: MarCELL Cellular Temperature, Humidity & Power Monitor (Verizon) - Made in The USA - RVs, Pet Safety Monitoring, Second Home Monitoring, Greenhouse Monitoring,- 24/7 Monitoring & Instant Alerts
From MarCELL
About this Item
- Best Value – MarCELL Subscription Plans for as low as $8.25/mo, nearly half of what our competitors charge. A MarCELL Subscription Plan is necessary since we operate on cellular networks.
- Cellular Advantage - MarCELL can be used anywhere there is a Cellular Signal and continues to operate in power outages, unlike Wifi Devices
- 24/7 Continuous Monitoring - Receive alerts via text, call or email when temperature and humidity levels reach critical levels, or power is lost
- Real Time Readings - Whenever you check the webpage or app the readings will update (15 minute refresh after first reading)
- Monitor From Anywhere - Use our intuitive app to view your readings at anytime, from anywhere. Review historic data and get instant updates on current environmental conditions
Product Description
Product Guidance & Documents
Feedback
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