Usage Tips: Supports high voltage 5-9V receiver. 300W power relay. Transparent heat shrinkable tube allows users to clearly see the LED working status, with a stylish appearance. Two LEDs indicate working status. Maximum DC 30V 10A. Includes no signal protection and boot protection for easy operation. Input channels do not require calibration and are compatible with various brands of remote control devices. Compact size and lightweight design. Application range: Remote control model rocket launch, remote control model smoke control, weapon system control for realistic models, model aircraft smoke control, control of various remote switch systems, switching signals between two cameras, control the on/off function of various electrical power sources such as navigation lights, searchlights, strobe lights, buzzers, etc., control camera shutter or switch between recording and camera modes. Color: As shown. Material: PC + Metal. Package Contents: 2 x RC Relay Switch. Note: Light reflection and different displays may cause slight color variations between the item in the picture and the actual product. Measurement error allowance is +/- 1-3 cm.