Used iGs-012 lighting watchdog Keep your plants from dying of heat stress or overheating Once temperatures reach unacceptable levels, the IGS-12 temporarily turns off your lights and lets the room cool before bringing them back. Set the desired shutdown temperature and the off time before brining the lights back on with two simple dials. We are a used hydroponic reseller and are liquidating our storage space. Tons of items for sale and for free. If you are looking for anything in particular, we might have it. Just ask. Please check our other listings and have a great day.