Specifications: 1) Transmission frequency: 1,500mW 2) Working frequency range: 1.5GHz 3) Channel selection: four channels, synchronization of audio and video 4) Transmit distance: 1,000-4,000m (no barrier) 5) Working voltage: DC 12V (transmitter) 6) Working current: 400mA 7) Working temperature: -10°C to +50°C 8) Transmitter size: 70 x 41 x 14mm 9) Transmitter weight: 112g 10) Receiver size: 115 x 60 x 21mm 11) Kit contents: 12-channel receiver, transmitter, two small antennas, transmitter connecting lines, audio/video connection lines. 12) Other available specifications: 100mW, 500mW, 700mW, 1,500mW, 3,000mW, 5,000mW