Review: good unit.Things that will confuse you at setup: many.You'll need 4 AA batteries and two AAA.Power up the remotes first.A few minutes later power up the base unit.The order of the reporting screen on the base unit is:Sensor 2------------Sensor 1------------Main unitThat will confuse a few who aren't paying attention.I cannot stress this strongly enough, if you're using this the way I am, to monitor fridge and freezer temps, put the sensors where they will be, and... Walk away. For a couple hours, just go away.Don't set any alarms until the remote probes are at the temperature range they're going to live at. Reason: they will be outside of the temperature range you just set, so they will alarm. Over and over and over... So don't tell them the range until they are already in the range.When you program the minimum and maximum temps for alarm purposes, the number you are programming stays there while you're programming it, then disappears FOREVER, being replaced by the current min and max recorded since the last push of the CLEAR button. This is by design.To program high and low alarm limits:1. Hold the alarm button until Max limit flashes.2. Use + and - buttons to adjust (NOTE: As soon as you are done setting it and move on to the min limit, the display reverts to actual temp. There is NO way to "see what it's set to")3. Tap the alarm button to move on to min limit setting, repeat process to set that limit.4. One more tap of alarm button to finish up.To silence an ongoing alarm, first determine what's alarming. The alarm icon will be flashing on the affected line, and the temp will be outside of limits.Simply press the alarm button and release to silence.If you press the button while the alarm is sounding, it silences. If you press it while it is not sounding, it will turn off the alarm altogether.Answered questions:YES the sensors somehow find a way to send a signal from a steel box to a unit outside the steel box. I'm assuming it gets thru the door gasket.YES it appears to function just fine for this use.YES Battery life is good. The display units' batteries failed after several months, when it started going off day after day for too cold in the freezer, but that was hours and hours of chirp-chirp-chirp-chirp over several days. Based on similar stuff I have outside monitoring my weather over Wisconsin summers and winters, it shouldn't chew thru more than a set of batteries per year per sensor.YES, in my house at least the signal from the remote probes is strong enough that I can move the base unit to the kitchen on the first floor, instead of sticking it on the basement freezer, where I'm less likely to hear an alarm going off. Your mileage may vary in that regard but feel free to test.Others mention a backlight in the unit, I don't see one. So you'll need your flashlight to see the screen if the power is out and you're wondering whether your ice cream is still frozen.I WISH the things talked to my Tuya app so I could monitor it from anywhere and silence alarms from anywhere, and all that, but it doesn't and it doesn't have to. Still very happy with this unit after several months.

BOTTOM LINE: Affordable, simple way to monitor the temps in your refrigerator and/or freezers to insure that your food stays at the temps it should. Pop in batteries, set upper & lower limits and forget it. About as simple as it gets. Very happy. Well worth it for the peace of mind. 5 STARSTHOUGHTS: Having just filled our large chest freezer in the basement with a half Angus beef, I thought it might be a good idea to make sure things are staying at the proper frosty temps. Our freezer is decades old while it's always just chugged along without complaint, you just never know when it might give up the ghost. That'd be a helluva lot of perfectly good food (and money) gone to waste if it ever did. We don't go down there to pull food out or check on a daily basis so, after some internet researching, this inexpensive little remote thermometer seemed like a good way to keep tabs on things. As a bonus, this unit is set up for two individual sensors/monitored readings, so I placed the other sensor in the bottom drawer freezer in our fridge in the kitchen. Now they're both being closely monitored, so hopefully we'll never have any ugly surprises! Instruction booklet was helpful, but setting was an intuitive deal. Set upper & lower limits, decide whether you want an audible alarm for each sensor (about as loud as most cooking timer alarms) and place it where it's most convenient for you. (Receiver unit has a hole to allow for mounting on a nail or screw, a pop-out foot to allow you to set it upright on a counter or widow ledge, and 4 strong magnets so you can attach it to your stove or fridge. Main receiver unit takes 2 "AAA" batteries, remote sensors take 2 "AA" each. The manufacturer recommends using lithium batteries, for longer life. I'm not sure if regular batteries would last very long sitting in the single digit temps of the freezers, so I sprang for a set of Energizer Lithium batteries - just to be on the safe side.*** I also wanted to mention that when I got mine, I couldn't get a reading from Sensor #1. I tried different batteries and whatnot, but to no avail. I contacted the vendor (AMIR) and they quickly & politely responded with several suggestions, which I tried... but still no soap. I emailed them again and they offered me a complete refund and asked if I'd be willing to take a chance and re-order. I did, and within a couple of days the replacement arrived. When I put the batteries in, I quickly discovered that the fault with that first, original unit wasn't with the remote sensor but rather the main receiver/display monitor; the readout for sensor #1 was dead. Oddly, they said I didn't have to bother returning the defective original. So now I have a second one which only displays one reading, but rather than throw it away or let it sit in a drawer I simply used the fully functional replacement unit to monitor our freezer AND fridge upstairs, and now that original unit with only one working temp is dedicated to the big downstairs freezer. Now I can keep tabs on EVERYTHING being kept chilled or frozen. Win-Win! THAT is what I call outstanding customer service!

For the price, this is quite amazing. The build is very solid, no flimsy plastic. The measured temperatures are accurate and sensitive. I was worried that I might have trouble with the sensors connecting to the display as my house is notorious for poor WIFI reception. But I have had zero issues with the two sensors in the basement connecting to the display on the main floor. I wish they made WIFI access points!

Works real well I use them in my kegerator and my spare fridge. My spare fridge doir sometimes does not close properly but this system lets me know when the temperature goes above a preset value.In my kegerator, I keep the temperature at 2⁰C but occasionally the temperature gets close to zero and I get a warning which is awesome.Works perfectly. No cons.

Easy to set up, quick to get working. Great design.

Never miss the problem with the temperature in the freezer or refrigerator. Get notifications and alarm once door is still open and temperature is not as expected. Wine and your beer/barbecue/ chest freezer or refrigerator will be always under control. 😉

冷蔵室と冷凍室の温度をワイヤレスで取得するために購入。温度精度はそれなり。本体、子機、ともに2年ほどで壊れるため再購入が必要だが、別タイミングで購入した本体と子機でも認識する。