This product is PWM controlled relay switch, different from effect tube, it is directly established physical line connection, so can adapt to higher DC voltage, but also can connect to AC. Control terminal: Input voltage 5v (connected to receiver) PWM control: at high ( 1750us), NO(Normal Open) and COM(Common) are connected (at the same time, NC(Normal Close) and COM(Common) are disconnected). (This means that NC(Normal Close) and COM(Common) are connected at all times except 1750us) Here PWM is the steering gear signal, can turn the steering gear, you can use this device There are solder joints can be set to delay 3 seconds, automatic disconnect Connecting end 30V DC allowed current 2A, 125V AC allows current 0.5A Motherboard size: length width height 29 x 9 x 8 mm White Relay size only: 10 x 6.5 x 5.4 (mm) The power consumption of the relay coil is about 140mW Color: As Shown Material: composite material Package Contents: 2 x PWM 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.