Specification: Module chip: NE555 chip Delay modue: delay connect module Input voltage: DC12V Control voltage: AC 0~250V / max 10A, DC 0~30V / max 10A the operating voltage: 12 volts DC; (otherwise 5V optional) Max load: 2200W Applications: Vehicle equipment-delay to prevent car ignition, prevention of high sudden current to burn components and devices. Module performance and features: 1.Turn on the power relay and delay the pull-in. Specifically: after supplying 12v power to the relay, the relay will immediately suck and relay output status: Normally open and public disconnect, normally closed and public conduction; wait until the delay is 1-10s (can be adjusted), the release of the relay and at this time, the state of the relay output is: Normally open and public conduction, normally closed and public disconnect; this state will be maintained as long as the module is continuously powered. 2. The delay time is adjustable, (0 ~ 10 seconds) 3. Increase the potentiometer can increase the delay time 4. Increase the capacitance C1 can increase the delay time 5. Possess of input power indicator 6. Possess of relay pull-in indicator 7. can control the AC 220V/10A equipment. (Maximum control device 2000W) 8. Possess of relay freewheeling protection 9. Delay time formula: T=1.1RC. For example: Capacitance 100uf resistance 100K T = 1.1 * 100000 * 0.0001 = 11 seconds Package Included: 10 X NE555 DC 12V delay timer module The timer delay is made of electronic accessories, inner conductor is pure copper. it is long lasting and durable for you to use. 12V module, the output can be connected to AC 250V 10A and DC 0-30V/max.10A equipment, and the max control equipment is up to 2200W. NE555 delay module, which consist of high-precision potentiometer ( adjust the output frequency.), high frequency filter capacitor and with input power indicator, with the relay is energized light . The timer switch relay module can be adjustable timer delay(default setting:0-10s) and counter clockwise adjustment of potentiometer to increase delay time. Useful for applications in equipment-delay to prevent sudden high current which can burn components and devices. A wide range of applications: The adjustable timer switch relay module is designed with relay module continuous current flow protection. This module is perfect for SCM learning, electronic competition, product development, graduation design and so on.