Frequency: 5.8G Transmission Channel: 40 Operating mode: Key button, Smart Audio Transmission power: Switchable: PIT, 25mW, 2500mW Antenna connector: MMCX Power input: 7-36VDC Current consumption: 800mA/12VDC @ 2500mW RF impedance: 50 Inputvideo impedance: 75 Input video amplitude: CVBS 0.8~1.2VP-P Video format: NTSC/PAL Dimension(L x W x H): 41mm x 25mm x 13mm Function Button Operation Instructions: To switch frequency - Click the button, the red-light flashes and goes out, then you can switch to frequency. (Note: The red light of the first frequency of each frequency band is a constant light indicator) To switch frequency band - Press and hold the button for 2 seconds. When the blue light flashes, release the button to switch to frequency band. To switch power - Press and hold the button for 4 seconds, the blue light will flash to green light (/steady on/flash) to switch achievement. Due to different batches, the appearance, color and printed words of the product , which will not affect the use. Colour:Black Material:Composites Package Contents: 1x 2.5W VTX 2x Connection cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.