Frequency: 340 MHz. Input voltage is 12VDC and is polarity protected. The output relays are rated at 10 amps @ 30VDC or 120/240VAC. Operating temperature range - 0o F to 160o F. Receiver dimensions are approximately 1.5" L x 1.5" W x 1" H. The flexible antenna extends 3" above the top of the receiver. Transmit range is greater than 100 feet under normal operating conditions. Up to 12 keyfob transmitters can be used with each receiver.