Timer Relay Module, DC 5V 12V 24V Adjustable Switch Cycle Timer Delay Relay Module, Delay On Off Switch Relay Module 6 Types Optional Time Delay (DC 12V 0-120 minutes adjustable)

Shipping took a month. Neat device. Definitely takes time to bench test to get your "on" time and "off" time where you want it. No instructions came with it. Relying on the Amazon seller pictures and other similar devices on Amazon to help get this figured out. Red and Black wires recieve your voltage. Red+ Black - Don't cross the polarity or it's TOAST! Yeah, gotta spell that out to some folks. This was the 12v version in my case. 2 white wires are the trigger wires to turn on the device. Either touch the 2 wires together or install a switch. I opted to wire them together permanently so the device automatically turns on when I supply the 12v to the red and Black wires. The jumper for T/10 & T is 2 different time scales you you can operate off of when adjusting the "on" potometer and "off" potometer. T is a very touchy long duration of time. A little adjustment goes a long way. Basically 0 sec to 24 hrs in adjustment in a 350° turn. I'm thinking the T/10 jumper is literally a tenth of the 24hr time period from T. So when this jumper is selected, we're talking a few seconds to 15-20 mins in a 360° turn. I was able to use the T jumper for my 1 minute "on" and 30 minutes "off". Took a few hours sitting around with a stop watch and making small adjustments. Last, the other jumper Mon or Cycle. Mon is only allowing the device to run your "on" and "off" 1 time while your device is powered on. Cycle runs your "on" and "off" time in a continuous loop, so long as your device remains powered. Hope this helps folks

This device works. As others have pointed out, the pots that control the timing are very sensitive - a tiny adjustment makes a huge difference in on/off delay. My application is to power my pickup's rear view camera for 3 minutes when I push a button so I don't wind up leaving it on. The last thing I am is an electronics wizard and it took me a while searching to figure out how to hook this up on the bench so that it worked. A schematic or sketch on the product page would have saved me a few hours of frustration. I actually returned one of these for a replacement before I realized what I was doing wrong. Hopefully, the attached sketch will save other electronically-challenged people some time. For my application, the jumpers are set to MON and T/10 and the ON potentiometer is about 1 tick back from full clockwise and the OFF potentiometer is full clockwise.