This is the Competition Heat "Deuce" 12V DC Nitro Engine Heater The Competition Heat "Deuce" 12 Volt Engine Heater allows you to pre-heat your engine without the use of a heat gun before starting your engine on the starter box. The Competition Heat 12 Volt Engine Heater was designed to uniformly heat all the critical internals of your engine, to help relieve the stress on the crank, con-rod, piston and sleeve during warm-up. It will properly pre-heat your engine to 180-200°F in as little as 10 to 15 minutes (depending on ambient temperature). This engine heater is the result of 40+ years of racing experience by its designers and is one of the most technologically advanced products to hit the nitro R/C market in years. The Competition Heat .21 R/C racing engine heater uses technology similar to that used by the Aerospace Industry, Formula 1, Indy Car and NASCAR Teams