This is a durable, safe and reliable electric heating thermostat that is easy to install and program. It can provide uniform and comfortable temperature control. Free mobile app allows you to control your thermostat from anywhere & anytime conveniently, which fits in your lifestyle and gives you an energy-saving and comfortable living environment. It"s suitable for use in office buildings, hospital, school and entertainment places for temperature control. Features: thermostat to control electric heating system, with touch buttons for simple operation. LCD display with backlight to display data clearly, easy to read data even in the dark.   Weekly programmable and 5+2 six periods programmable to maximize comfort and economy, very flexible. 0.5 degrees C accuracy, keeping the comfortable temperature within the level you set. Data memory function when power is off; keypad locking function. Create thermostat group for centralized control. App remote control, convenient for you to control your thermostat with your mobile device. Voice control, compatible with Echo, Google Home, IFTTT.  Specifications: Color: White / Black(Optional) Shell Material: PC + ABS(Fireproof) Display: LCD with Backlight Sensor: NTC 10K  Power Supply: 95 ~ 240 VAC, 50 ~ 60Hz Current Load: 16A Power Consumption: less than 1.5W Accuracy: +/-0.5 degrees C Timing Error: less than 1percent Set Temp. Range: 5 ~ 35 degrees C Display Temp. Range: 5 ~ 99 degrees C Support System: For iOS 8.0 and higher or for Android 4.1 and higher Ambient Temperature: 0 ~ 45 degrees C Ambient Humidity: 5 ~ 95percent RH (Non Condensing) Storage Temperature:5 ~ 45 degrees C Installation Hole Distance: 60mm Installation Box: 86 * 86mm Square or European 60mm Round Box(Not Included) Wire Terminals: Wire 2 * 1.5mm² or 1 * 2.5mm²  Protection: IP20  Item Size: 86 * 86 * 13.2mm  Item Weight: 161g  Package Size: 10.5 * 9 * 6cm  Package Weight: 267g  Package List: 1 * Thermostat 1 * 2.5m External Sensor 2 * Mounting Screws 1 * User Manual(English) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.