MCU watchdog circuit and special reset chip. The module Power-on, When triggered the relay is switched on, delay T1, and the relay disconneted. The module Power-on, When triggered the relay is switched on, delay T1,and the relay is disconneted, delay T2.
Dual Time Adjustable Cycle Delay Timing Relay Infinite Loop Timer Module AC 100/110/120/220/
DC 5V 12V 24V Infinite Cycle Delay Timing Time Relay Timer Control ON-OFF Loop Switch Module Double Adjustable 0-100 Mminutes
Adjustable Dc 12v Relay Timer On/off Timer Switch Relay Module (0-60 Minutes) 70x20mm, 1 Pack
Dual Time Adjustable Cycle Delay Timing Relay Repeat ON OFF Switch Infinite Loop Timer Module AC 100V 110V 120V 220V 230V 240V - Price history & Review
WS16 DC 12V Infinite Cycle Delay Timing Time Relay Timer Control ON-OFF Loop Switch Module Double Adjustable 0~120 Minutes - Price history & Review, AliExpress Seller - Fancys Module Mall
TEAMNIGT 2 Pcs DC 12V Infinite Cycle Delay Timing Timer Relay Module 0-15mins Adjustable Times Switch Delay On/Off Switch Loop Module : Tools & Home Improvement
Acxico 2Pcs DC 12V Infinite Cycle Trigger Delay Timing Timer Relay ON Off Loop Module: : Tools & Home Improvement
DC 12V Infinite Cycle Delay Timing Timer Relay ON OFF Switch Loop Module With LED Display - iduino
Acxico 2Pcs DC 12V Infinite Cycle Trigger Delay Timing Timer Relay ON Off Loop Module: : Tools & Home Improvement
DC 5V/12V TIMING Timer Delay Turn OFF Switch Time Relay Module 1~10s Adjustable £4.50 - PicClick UK
12V Infinite Cycle Delay ON OFF Timer Relay Switch Loop Module Price in Pakistan
Infinite Cycle Delay Timing Timer Relay ON OFF Switch Loop Module DC 5V 12V 24V