Remote and Multi-Space Temperature & Humidity Monitoring: Simply add to the for HomGar app via a 2.4 GHz Wi-Fi network (incompatible with 5.0 GHz); access real-time data from anywhere, anytime; the included base station supports up to 10 sensors, expanding your home coverage indoors and outdoors. Highly Accurate: high-precision sensor; temperature accurate to 0.36F (0.2C) with -40-+60(-40F-+140F) range, while humidity is 2% RH with a 0-100% RH range; using this in a refrigerator or freezer is not recommended, as the metal casing can block wireless signals, leading to reduced communication range. Timely App Notification: If the temperature and humidity exceed that range you preset, you receive an immediate notification, so you can quickly react to any sudden changes in the cigar humidor, greenhouse, or any other location, even you are away Temperature: -40-+60(-40F-+140F). Humidity: 1%RH-99%RH. Frequency: 433.92 MHz,up to 100m transmission distance in open air (The product printed words depending on the batch, but this does not affect use) Color: White Material: ABS Package Contents: 1 x Thermometer Hygrometer Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.