The GRD-2 is a 2-channel Gate Receiver designed for use with automatic gate operators or systems where a remote antenna is needed. The GRD-2 can operate two gates, one gate and an obstacle sensor, or channel one can open the gate and channel two can close the gate. The receiver uses the Delta-3 radio format, with 256 possible codes for each channel, set by dipswitch.Auto voltage sensing - no jumpers to setTwo Form A (normally open) relays rated at 30 Volts AC/DC up to 5 AmpsSupplied with whip antenna, three feet of coaxial cable, and bulkhead connectorPower: 12 - 30 VAC or 10.5 - 30 VDCCodes: 128 (set by dip switches)RF frequency: 310 MHzDimensions: 3.625" W x 5.25" H x 1.5" D