This device is used to supply power to a car device at a delayed time.

Specification:

• Size:  77mm X 23mm X 18mm
• Chipset: NE555
• Voltage: DC 4-7V 
• The delayed time is adjustable, 0-10 seconds
• Maximum power: 2000W. AC: 0-250V, current: 0-10A. DC: 0-30V, current: 0-10A.

Note: it's recommended to add insert a diode in the control positive to present use connect the control polarity wrong.

Schematics: