This is our DC 12V/24V flash controller with 7 different flash modes & steady on function
Red + (IN) is hot/positive wire, and usually goes to your switch.
Black - (IN) is the ground wire input & should tie into your negative system or negative battery.
Red + (OUT) should go to the hot/positive wire on the lights that you want to operate.
Black - (OUT) should tie into your light's ground wire.
Push the unlock button on your key-chain controller and lights will come on. Push the lightning bolt button and lights will flash, continue pushing that button to change the flash patterns. Push the bottom right button on the key-chain and you get a steady on light with no flash. Push the lock button to turn off.