Operating instructions: Frequency switching: Click to switch. (Blue light CH1/CH2/CH3 indicates current frequency) Frequency group switching: Long for 2 seconds to enter switching mode, click to switch.(Red light blinking times indicate the current frequency group).Frequency group A/B/E/F/R/L Power switching: and hold for 6 seconds to enter switching mode, click to switch. (The number of times the green light blinks indicates the current power).Power 25/400/800/1.5W/3W(Setting is completed after 8 seconds of resting automatically save and exit) Channel meter indication description: 1. Power indicator/green light 2. CH1 frequency indicator/blue light 3. CH2 frequency indicator/blue light 4. CH3 frequency indicator/blue light 5. Frequency Group Indicator/Red 5VOUT/GND/VIDEO/RX(SA)/GND/VIN(6-28V) Note: Please install the antenna to use Material: Metal colour: As Shown Package Contents: 1 x Transmitter 1 x Connecting 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.