5pcs 12V Power On Delay Relay Module Delay Circuit Module NE555 Chip Geekcreit for Arduino - products that work with official Arduino boardsDescription: The module when power is turned on, the timer is started immediately (time range is adjustable), the relay immediately pull switched common terminal of the relay and often the beginning of the end of the time delay, the relay is released, the common and normally closed terminal is turned on. Feature: Imported high quality delay chip design, the performance is far better than the 555 chip Delay time range selection, the shortest 0. 1