Support high voltage 5-9V receiver. 300W power relay. Transparent heat shrinkable tube help users see the working status of the LED clearly, stylish appearance. Two LEDs indicate working status. Max DC30V 10A Add no signal protection With boot protection, easy to operate Input channels do not need to be calibrated, compatible with of remote - control devices Small size and light weight Application range: Remote control model launch Remote control model smoke control Weapon system control like real machine Model aircraft's smoke control Control of remote switch systems Switch the signals of two cameras Control the opening and closing of electrical power sources, such as navigation lights, searchlights, strobe lights, buzzers, etc. Control the camera shutter or switch the camera's recording and camera mode. Colour:As shown Material:PC+Metal Package Contents: 4 x RC relay switch 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.