Feature: 1. Various Modes: Comes with 2 working modes, infinite cycling mode and single timing mode, satisfying your varied work needs. 2. Reliable Work: Using single chip microcomputer as the main control core, the relay module has high accuracy, very reliable. 3. Timing Ranges: Has 0‑100 seconds, 0‑15 minutes, 0‑30 minutes, 0‑60 minutes, 0‑120 minutes, 0‑24 hours and other time range. 4. Simple to Use: 2pcs adjustable resistor are used to adjust the time, and the on and off time can be independently adjusted. 5. Stable Working: The external contact is activated, and the timing is started by short circuiting with the self reset button. It is also possible to short circuit the triggers together and start counting down when power is turned on. If it is triggered again during operation, it will be disconnected immediately. Specification: Item Type: Relay Module Single Mode: 1. Do not operate after power on, the relay is turned on after triggering, and disconnected when the time is reached. 2. During the delay period after the relay is turned on, triggered again and the delay will be interrupted immediately. Loop Mode: 1. After the power is turned on, the relay will not operate. The relay turns on after triggering, and turns off after reaching T1 time. Turns on after reaching T2 time. In this cycle, T1 and T2 are set by 2 adjustable resistors. Time Range: 0-100 seconds, 0-15 minutes, 0-30 minutes, 0-60 minutes, 0-120 minutes, 0-24 hours and other specifications. . Package List: 1 x Relay Module Note: No need to trigger the button, when it's powered up, it starts the loop instead of pressing the button. Then short circuit the trigger wire of the button.