[APP Remote Control] - Download Smart Life/Tuya Smart APP on your phone&Tablet to control the thermostat anywhere/anytime. [Hand Free Voice Control] - Compatible with for Amazon Alexa, for Google home,Yandex Alice ect ,a simply command to voice control the thermostat. [Screen Backlight Brightness Adjustable] - 3 level screen backlight brightness adjustable,also backlight can be turned off,offer a nice sleeping environment for you. [Accurate Temperature Adjustment,Detection Display and Hysteresis] - The accuracy have reached 0.5℃,0.1℃ and 0.5℃,accurately control your room temperature. [Simple Manually Mode Change Operation ] - Press "M" key to change mode between Cooling, heating and ventilation. [Ventilation Mode Adjustable] - Low,Middle,High and Auto 4 mode for option [Family Share Function] - You can share the thermostat to your family with the limited right,create a smart home together with your family member [Linkage Function] - It can linkage with other smart appliance in your home to create smart theme like leave home mode,back home mode,dinner mode,sleeping mode ect [Group-Control Function] - the thermostat can be set in group with other thermostat in different room, realize group control function in special scene [Child Lock Function] - Child Lock function avoid kid`s operation on it. Make sure your home in smart and safe status Power Supply:110-220V, 50 - 60HZ Fan Relay Amps Resistance:5A; Inductive:3A Valve Relay Amps Resistance:3A; Inductive:1A Sensor:NTC3950, 10K Accuracy:±0.5℃ Set Temp. Range:5 -35℃ Dispaly Temp. Range:5 - 99℃ Ambient Temp.:0 - 45℃ Ambient Humidity:5 - 95% RH (Non Condensing) Storage Temp.: -5 - 45℃ Power Consumption:Less than 1.5W Timing Error:Less than 1% Specifications:B: 4Pipes heating & cooling 2-in-1 Color:As Show