This receiver will respond to the wireless RF signals sent by the universal transmitter, motion detector, miniature magnetic contact transmitter, pendant transmitter and 4 button transmitter on this page. The receiver has both normally open and normally closed terminals for each channel. The state of these terminals changes when it receives a signal from a transmitter, eg. the N/C contact becomes open and the N/O contact closes. When the signal stops, the contacts revert to the original state. A transistor output of 12V 25mA that can be connected to a supplied buzzer or other device becomes live when the battery low signal is received from a transmitter. A 12VDC power supply (at least 105mA for 4 channel receiver) is required. Contacts are rated at 1A 24VAC/DC. Four, two and one channel receivers are available. One channel version does not have the battery low output.The receiver has both normally open and normally closed terminals for each channel. The state of these terminals changes when it receives a signal from a transmitter, eg. the N/C contact becomes open and the N/O contact closes. When the signal stops, the contacts revert to the original state. A transistor output of 12V 25mA that can be connected to a supplied buzzer or other device becomes live when the battery low signal is received from a transmitter. A 12VDC power supply is required. Contacts are rated at 1A 24VAC/DC. Also available in 4-Channel and 2-Channel versions. One channel version does not have the battery low output.