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. BAC-300 series modern round touch screen room thermostats are designed to on/off control the fans and valves in air conditioner applications via comparison of the room temperature and setting temp. as reaching the aim of comfort and saving energy. Features: 0.5°C Accuracy keeps temperature within the level you set. Clock memory when power is off. 5+2 six periods programmable maximize comfort and economy. Create thermostat group to centrally control. All setting languages synchronize your time zone, address and language. 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) Color: BAC-3000AL, BAC-3000ALW,  BAC-3000EL, BAC-3000ELW: White, Black BAC-3000ALW, BAC-3000ELW: Silver (optional) Power Supply: 95 ~ 240 VAC, 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: ＜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 Package Weight: BAC-3000AL/BAC-3000ALW: 220g / 7.76ounces BAC-3000EL/BAC-3000ELW: 224g / 7.9ounces Package Size: 108 * 90 * 60mm / 4.25 * 3.54 * 2.36in 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 Note: The thermostat only can be used for central air conditioning system and control fan coil. Two pipe valve: hot water supply in winter for heating, and cold water supply in summer for cooling. Four pipe valve: cold and hot water supply at the same time, heating and cooling at any time. Packing List: 1 * Thermostat 2 * Screws 1 * Wall Plate 1 * User Guide 1 * Thermostat 2 * Screws 1 * Wall Plate 1 * User Guide