Being cold in the stand isn&';t any fun. Come unprepared and the elements will quickly drive down your core temperature and send you running back to the truck. With 5 internal heating elements, the Oculus Heated Vest is designed to keep you warm where your body needs it most. Pound for pound this could be the most important piece of your hunting arsenal, and with a state-of-the-art heating element control interface, you can fine tune your core temperature to match the conditions in the stand. Polyester/Spandex Blend 3 Heat Controls For 3-10-Hour Work Time 12V 5 Elements Heating System, 2 On Chest, 2 On Back Bottom, 1 On Back Top One Lithium-Ion Battery Pack ("SAMSUNG" Li-Ion 12V/2600mAh) One Charger (CE, 100-240V-Input) 2 Pockets (One For Battery)