Only 5V voltage receiver is supported, otherwise the module may be damaged. If the receiver and the servo are using a high voltage system, the module should be added with a buck module.One channel servo signal input, control one way electronic switchOne way LED indicates working statusWith boot protection, easy to operateInput channels do not need to be calibrated, compatible with all brands of remote control devicesApplication:- Remote control model rocket launch- Remote control model smoke control- Weapon system control like real machine- Smoke control of the model aircraft- Control of various remote switching systems- Switch the signals of the two cameras- Control the opening and closing of various electrical power sources, such as navigation lights, searchlights, strobe lights, buzzers,water pump etc.- Control the camera shutter or switch the camera's recording and camera mode.How to use:1. Connect:Plug the signal cable into an idle receiver channel that corresponds to a switch on the remote.The power indicator will be lighted when connected to the receiver.The work indicator lights up when the switch channel is open and vice versa.2. Working mode:The red LED light is a power indicator.Another red LED indicates the relay's operating status.-- Specification & Features --* Maximum 20A current* Size: 41mm*16mm*14mm* Net Weight: 13gItem Contains 1 x RC Model Receiver Control Switch 20A Relay