... in low light conditions5,Reliable RF communication utilising 433 MHz band with 1 % duty cycle limit to minimise communication disturbance6,EEPROM ... %6, Dimension: 123x90x48mm H x W x DRF1, RF operation band: ISM (433) MHz, 1% duty cycle2, RF communication range: 30 ... , RF binding method: Factory pre-bound with the room unit Wireless Thermostat