Features 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. Specifications BAC-002 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. Specifications: Shell Material: PC +ABS ( Fireproof) Model: BAC-002AL, BAC-002ALW, BAC-002EL, BAC-002ELW (optional) Color: White, Black, White & Black, Black & White (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 Cell: CR1220 button cell (not included) Item Size: 86 * 86mm / 3.39 * 3.39in Package Weight: BAC-002AL/BAC-002ALW: 221g / 7.8ounces BAC-002EL/BAC-002ELW: 225g / 7.94ounces 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 Package List 1 * Thermostat 2 * Screws 1 * Wall Plate 1 * User Guide