The main chip: NE555 Working voltage: DC12V Colour: red+green+blue Material: PC, Metal Size: 6.8 x 2.1cm Controlled AC 220V / 10A device. (maximum control equipment 2000W) Stream with relay protection. The relay time delay and power supply is connected. Specific as follows: for 12V power supply to the relay, relay not immediately and absorption, relay the output status to: normally open and public disconnect, normally closed and public conduction; Wait for delay 1-10s (adjustable), relay and absorption, at this point, the relay outputs status to: normally open and public conduction, normally closed and public disconnected; As long as the module power continuously, this state will remain. The delay time is adjustable, (0 ~ 10 seconds) Increasing the potentiometer can increase the delay time The capacitor C1 can increase delay time With input power light A relay and indicator lights The delay time formula: T = 1.1 RC. For example: 100 uf capacitance resistance 100 k T = 1.1 * 100000 * 0.0001 = 11 seconds The on-board equipment on the time delay, prevent excessive current when the car lighter burned on-board equipment. Need to have order to start the occasion, to prevent multiple devices at the same time starting current is too large burning appliances. Package Contents: 5 x NE555 Delay Relay Shield Timer