Hi Eric. It runs off 12 volts which plugs into the socket, (with small red LED), at the right. The switches control the heater & whether in constant or flash mode. The pot on the other side controls the flash rate, which is variable from ~1 sec on/1 sec off, to 1 sec on/4 sec off. I do not touch the original on/off dimmer switch.
HTH.
L.