1、0.5°C Accuracy keeps temperature within the level you set. 2、Clock memory when power is off. 3、5+2 six periods programmable maximize comfort and economy. 4、Create thermostat group to centrally control. 5、All setting languages synchronize your time zone, address and language. 6、No limit to add rooms and support intelligent scene. Specifications: Shell Material: PC +ABS ( Fireproof) Model: BAC-3000AL, BAC-3000ALW,  BAC-3000EL, BAC-3000ELW (optional) 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: ＜1.5W Timing Error: < 1% Installation Box: 86 * 86mm Square or European 60mm Round Box Wire Terminals: Wire 2 x 1.5 mm2 or 1 x 2.5 mm2 conservation Class: IP20 Buttons: Capactive Touch Buttons Item Size: 86 * 86mm / 3.39 * 3.39in Model Definition: A : Two pipe; Control Fan Coil Unit and Two Wired Motorized Valve L: Backlight W: Wifi connection E : Four pipe; Control Fan Coil Unit and Two Wired Heat Valve and Two Wired Cool Valve 1 * Thermostat 2 * Screws 1 * Wall Plate 1 * User Guide