Features 1、After power-up, when there is an external trigger signal, the module start delay, and outputs a signal, when delay time over ,the signal output end 2、Adjustable delay time (0‑120 seconds). Adjustable time External trigger delay module support 5V 12V 3、With led light indicates the output level. The output frequency is continuously adjustable using the onboard jumpers and potentiometers 4、Can connect relay module ,achieve to control large current work status 5、On-board test button, you can use IT as a trigger button Specification Features: 1. After power-up, when there is an external trigger signal, the module start delay, and outputs a signal, when delay time over ,the signal output end. 2. Adjustable delay time (0-120 seconds). 3. With led light indicates the output level. 4. Can connect relay module ,achieve to control large current work status. 5. With input power indicator. 6. On-board test button, you can use IT as a trigger button. Specification: Condition: 100% Brand New Input: VCC: 5-12V GND: Ground IN: Trigger terminal: high level effective Output: OUT: output signal, when no trigger is low level, after triggered is high level,restore the low level after the delay ends GND: Ground Size: 40x20mm Package Includes: 1 x Adjustable NE555 Module Package List