About the product1. Acrylic lens to avoid the finger scratch 2. Touch Button makes simple operation 3. Large screen display with backlight, easy to read, even in the dark 4. Four periods program schedules maximize comfort and economy 5. One-touch temperature control overrides program schedule at any time 6. Precise comfort control keeps temperature within 1 Celsius Degree of the level you set 7. Data memory when power is off 8. Easy installation 9. Designed to on / off control the fans and valves in air conditioner applications via comparison of the room temperature and setting temperature to achieve the aim of comfort and saving energyModel Definition of ThermostatA1: Two pipe: Control fan coil unit and two wired motorized valve. (When room temperature reaches the setpoint, both will turn off) A2: Two pipe: Control fan coil unit and two wired motorized valve. (When room temperature reaches the setpoint, valve will turn off but fan will turn to low speed) B: Two pipe: Control on/off motorized damper C: Two pipe: Control fan coil unit and three wired motorized valve M: Two pipe: Control 0-10V motorized valve E: Four pipe: Control fan coil unit and two wired heat and cool motorized valve T: Clock L: Backlight P: Weekly programmable K: Keycard E: Eeternal sensor P and N could not be compatible at the same timeSpecification: General Material PC Sensor NTC Accuracy +-1 Celsius Degree Timing Error < 1 percent Power Consumption < 1.5W Power Supply 110-240V / 50-60Hz Current Load 1A (Inductive), 2A (Resistance) Size 86mm x 86mm x 13.3mm Package Include Package Contents 1 x Manual 1 x Thermostat 2 x Screws Package Weight One Package Weight 0.26kgs / 0.57lb One Package Size 11.2cm * 9cm * 6cm / 4.41inch * 3.54inch * 2.36inch Qty per Carton 60 Carton Weight 14.30kgs / 31.53lb Carton Size 60cm * 30cm * 25cm / 23.62inch * 11.81inch * 9.84inch Loading Container 20GP: 592 cartons * 60 pcs = 35520 pcs40HQ: 1375 cartons * 60 pcs = 82500 pcs