Feature:1. Better Control: Equipped with this timer relay module, you will find it much easier to control the on and off on your machine.2. Simple Setting: Through the potentiometer, you can adjust the time between 0 and 25 seconds with high accuracy, very reliable.3. Stable Working: There is a diode at the power end, which will prevent reverse connection as well as ensuring stable working.4. Practical Uses: Can be used on robot, car lamp delay, intelligent product development, automation equipment, smart home, etc.5. Easy to Install: 65mm x 16mm compact size together with a light weight brings more convenience to the installation.How to Use:The timer switch relay module is easy to operate. Simply power on the module and the relay energizes immediately. If there is no power, connect the terminal to the COM terminal. Specification:Item Type: Timer Relay ModuleProduct Size: Approx. 65 x 16mm / 2.56 x 0.63inWorking Voltage: 12VModule Control: 10A 250V AC, 10A 30V DC load below. Time Setting: The time can be adjusted by the potentiometer and the default is 0-25 seconds. If you need a longer time, you can replace the larger capacitor or potentiometer yourself. Delay Time Formula: T=1.1RC. For example, capacitor 47uf resistor 500K T=1.1 x 500000 x 0.000047=25.85 seconds. Wiring: The power supply of the module has a diode to prevent reverse power supply, so you can connect with confidence. Package List:1 x Timer Relay ModuleNote:Trigger signal can be high level or low level signal, suitable for industrial control, and the module can be triggered repeatedly.