This is a durable, safe and reliable gas boiler 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: High quality thermostat for gas boiler 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°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 Amazon Echo, Google Home, IFTTT. Specifications: Color: White / Black / Champagne(Optional) Shell Material: PC + ABS(Fireproof) Display: LCD with Backlight Sensor: NTC 10K 3950 Power Supply: 95 ~ 240 VAC, 50 ~ 60Hz Power Consumption: <1.5W Accuracy: ±0.5°C Timing Error: <1% Set Temp. Range: 5 ~ 35°C Display Temp. Range: 5 ~ 99°C Support System: For iOS 8.0 and higher or for Android 4.1 and higher Ambient Temperature: 0 ~ 45°C Ambient Humidity: 5 ~ 95% RH (Non Condensing) Storage Temperature: -5 ~ 45°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: 90 * 90 * 38mm Item Weight: 135g Package Size: 11 * 9.5 * 6cm Package Weight: 194g Package List: 1 * Thermostat 2 * Mounting Screws 1 * User Manual(English)