ZEX Plug-In Nitrous Bottle Heaters are calibrated for specific pressure ranges, maximum horsepower and consistent nitrous flow for engine safety. They are thermostatically controlled to ensure optimum bottle temperature and all electrical components are pre-assembled and molded into the heaters for ease of installation. These heaters use Velcro straps for fast and easy bottle installation. There are no wires to hook up, they simply plug into cigarette lighter or power port.