Transmitting unit weight: 78.5g/2.77oz Transmitter channel number: 8-ch Power input: 12V Transmitting current: 280mA Transmitting distance (air to ground): 800-1500m (for reference only, the distance may vary a lot depending on the environments) Transmitter unit Dimension: 45 x 53x 19mm Video signal resistance: 75Ω Antenna connection: SMA jack (modules side) Refer to here for connector type diagram