Extend the comfort range of your sleeping bag with active heating. Ignik's Heated Sleeping Bag Liner is an industry first, adding safe, controllable, and sustainable heat to any setup. Add to any sleeping bag (or on its own), with 40W of power and a max temp of 140-degrees F, easily adds 20-degrees to your bag's comfort range. Features: 2 - RCS HeatZone Sleeps 1 Output - 40w Max Temp - 140ºF | 60ºC Power Requirements 12v or 5v Standard Connector 5.5mm x 2.1mm barrel Included Adapters 5v USB-A Adapter Dimensions - 31in x 72in | 79cm X 182cm Weight 1.2lbs | 556g Stuff Sack For Use With 5v And 12v Rechargeable Batteries & Power Supplies. Great For: Outdoor Chairs & Bleachers Tailgating Outdoor Rec Extra Sleeping Bag Heat Cold Weather Hunting Radiant Carbon Strand Technology Ignik's Heated Sleep System is engineered to be an easy to use, safe, and re-usable heat source, with its patent-pending 3-Layer RCS Technology.The perfect accessory for all your outdoor recreation and adventure needs. Whether you need a little more comfort at the ball game, need to heat your core temperature in winter camping conditions, or just need to keep your tent or rv a little more cozy, Ignik's Heated Sleep Systems has you covered. Ignik's patent-pending Radiant Carbon Strand Technology eliminates the bulky wires of traditional heated blankets, providing a lightweight, portable heat system that delivers the maximum amount of warmth to your setup. Button Controlled Power And Comfort Level This 3 level button controlled feature allows you to adjust your heat however you like it while saving battery power when you need it. Why Its Better Carbon Fiber is known for is superior, high-end structural properties like being ultra-lightweight and super strong. It shares those same qualities as a heat conductor, making it an ultra-durable, lightweight and waterproof heating element that far surpasses the copper wires used in old-fashioned heating blankets. This Heated Sleep System is ready to go and designed to work easily with most rechargeable 5V and 12V USB and vehicle power supplies. Ignik Heated Sleeping Bag Liner