BEA's 900 MHz compact transmitters and receiver allow wireless activation of any door control. FCC Part 15 certification ensures proper compliance with federal radio frequency regulations. Performs up to 500 feet line of sight. Works through Low-E glass. Frequency hopping allows consistent transmission in areas with other 900 MHz devices. Up to four separate wireless receivers can be activated by a single transmitter. Multi-color LEDs on receiver provide installer with visual notification of signal strength and activation status. Red LED indicator on transmitter confirms transmission and battery life. A maximum of 75 transmitters can be programmed to one receiver. Transmits a unique rolling code each time the switch is closed.