The Vixen Optics Camera Bag Inner Heater makes it possible to prevent dew condensation, warm batteries, and protect your equipment. The bag's 14mm-thick urethane foam protects cameras and lenses from shocks and efficiently keeps contents warm. Padded dividers with touch fasteners on the bottom allow you to configure the bag to fit your gear and the bright yellow color makes it easy to identify black equipment and accessories. The heating unit is powered by a user-supplied external 5V, 1A USB battery and can be isolated within compartments. The heater will run up to five hours on a 5000mAh mobile USB battery.