Model: VTX20-600 Input voltage: 7-26V Output voltage/current: 5V/1A Number of channels: 40CH Transmitting power: PIT/25/100/200/400/600MW Dimensions: 27x27MM Screw hole: 20x20MM Screw hole diameter: 3MM Weight: 3 grams About the usage of the buttons (also refer to the frequency table in the following picture. The flight control needs to configure the JSON file we provide to achieve OSD parameter adjustment): Short press is to adjust the channel (corresponding to the green light, 1-8, a total of 8 times), Long press for 2 seconds is to adjust the group (corresponding to the blue light, A, B, E, F, R, a total of 5 times), Long press for 5 seconds is to adjust the power (corresponding to the red light, 25, 100, 200, 400, 600, a total of 5 times), Long press for more than 10 seconds is to open 11 prohibited USA channels. By default, the USA channels are not output and are prohibited: 5705, 5685, 5665, 5885, 5905, 5880, 5658, 5695, 5732, 5880, 5917 Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Colour:Black Material:PCB Package Contents: 1 x Transmitter KIT 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.