THE GREASE Heater from Legacy is a portable heating pack that keeps both a grease gun and a spare 14-oz. grease cartridge warm and ready to use on cold days. The user connects the power cord into a 12v DC outlet and plugs it into the Grease Heater bag. Grease is ready to pump in about 10 to 30 minutes. The temperature in the Grease Heater bag will be maintained below 75°F when a grease gun, loaded with a full grease cartridge, and a full, spare cartridge are placed in the bag. An adjustable shoulder strap is included with the product.