ITEM NAME:2X 12V NE555 Delay Relay Module Time Delay Switch Delay Adjustable 0~10 SYZ.Main chip: NE555. For example: Capacitor 100uf resistance 100K T = 10.1 100000 0.0001 = 11s. 1, Power relay 1-10s at a fixed period of closing and opening. With the indicator relay. With the input power indicator.