This module is a nice little relay switch controlled by a spare auxiliary channel on your receiver. Perfect for switching lights, sound, and any other auxiliary electrical items.when PWM duty is more than 1500us, the switch will turn on; when PWM duty is less than 1400us, the switch will turn off.Specifications:RX lead length:100mmPower in/out lead length:100mm (each)Input Voltage (DC):5-28VSafe-protection functionThis module has a safe-protection feature that reduces the likelihood of unexpected activation.In below 2 conditions the Safe-protection mode will active:1. The pulse is more than 1800us at first power-up, the MOSFET switch open. The LED will blink, you should move the input to the off position, then normal more will active2. The signal is bad continuously for 500ms, the MOSFET switch open. The LED will blink. When the signal is good, the device will deactivate safe-protection mode.LEDNormal mode: the LED will on when input pulse greater than 1800us; the LED will off when input pulse less than 1200usSafe-protection mode: the LED will fast blink color:As shownMaterial:plasticPackage Contents:1 x 10A RC Controlled SwitchOnly the above package content, other products are not included.Note: Light shooting 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.