These easy to install kits are the answer for protecting expensive electronic units that must be installed in low temperature areas, indoors or outdoors. They operate with enclosed covers. In addition to assuring continued operation of protected units, they also keep LCD's from becoming sluggish and help them stay visible. The 12-volt system (STI-6580) incorporates a 12-volt transformer and is rated at 25 watts. The 24-volt system (see STI-6583) is designed to get its power directly from a remote power supply (other than the fire panel) or CCTV power source. It is rated at 8 watts. Both systems include a foil heater pad with adhesive backing and a thermostat to maintain a setting of 40Ã‚Â° F (4.4Ã‚Â° C) inside the enclosure. Offers a one year warranty from the date of original purchase.