... Display 2. Three Fan Speed 3. Modbus, RS485 4. CE Blue Backlight Room Thermostat For FCU System 1.Product Features1Attractive Modern Styling ... Supply 24Vac , 110 Vac, 220Vac+/-10%, 50/60HzBacklight Green, Blue, WhitePower Consumption 3(1)ASensor Internal or ExternalSet Point Range ... Class - IP30Relative Humidity 95%RHShell ABS +PC fire- resistant plastic Blue Backlight Room Thermostat For FCU System