Multi-function Wireless Thermometer Hygrometer Indoor Outdoor High Precision Thermostat Temperature Controller with Color Alarm  Feature:  Temperature and humidity display, backlight display. Memory function, Celsius/Fahrenheit switch 12/24 switch.  When the temperature or humidity alarm condition is triggered, the corresponding alarm color of the receiver is turned on and accompanied by a beeping beep for 5 seconds. The corresponding alarm icon will keep flashing until the temperature and humidity conditions are no longer valid. In this case, the corresponding warning color of the receiver is turned on every minute and accompanied by a beep beep for 5 seconds, press any key to mute the alarm.  Specification:  Material: ABS + electronic components  Size:   Host: 12.5*2*12.5cm/4.92*0.79*4.92"  Sub-machine: 5*3.7*10.5cm/1.97*1.46*4.13"  Color: Black/White  Indoor temperature accuracy: range: 0~50℃,: ±1 resolution: 0.1  Outdoor temperature accuracy: Range: -50~70℃,: ±1.5 Resolution: 0.1  Note:  Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you   Please allow 1-3mm measuring deviation due to manual measurement.