DC 12V Delay Relay Shield NE555 Timer Switch Module, Adjustable 0 - 10 Second
Module based on: NE555 chip. Main Chip (NE555) Characteristics For example: capacitance 100uF resistance 100KT = 1.1 100000 0.0001 = 11 seconds. Put on the power relay and delay suction. This is a 12V Conduction delay relay module.