Quick RRC H904 Radio Remote Control Hand Held Transmitter - 4 ButtonQuick Hand Held Transmitter Features Number of Keys 4 Power Supply 3 alkaline AAA batteries or rechargeable Nims Microcontroller operated functions FSK modulation and carrier frequency 913Mhz Operating temperatures from 15C to +70C. Possibility to control more receivers with one transmitter Two functions can be activated at the same time Floating Also working with rechargeable batteries Keyboard backlighting by means of LEDs The number of function