This product is a PWM controlled relay switch, unlike power tubes, it is directly connected with physical wiring, so it can adapt to higher voltage, but can also be connected to AC power. Control Terminal: Input voltage 5v (connected to the receiver) PWM Control: at high (1750us), NO(Normally Open) and COM(Common) are connected (at the same time, NC(Normally Closed) and COM(Common) are disconnected). (This means NC(Normally Closed) and COM(Common) are connected all the time except during 1750us) Here is the PWM control signal for the servo, can control the servo, you can use this device There are solder points that can be set to delay 3 seconds, automatic disconnection Connection end 30V DC allowable current 2A, 125V AC allowable current 0.5A Circuit board size: length width height 29 x 9 x 8 mm White relay size only: 10 x 6.5 x 5.4 (mm) Relay coil power consumption is about 140mW Color: As shown Material: Composite material Package Contents: 1 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 to differ slightly from the real one. The allowed measurement error is +/- 1-3cm.