This headlamp is a great choice for cold-weather activities. For optimal performance in the cold, keep the remote battery-storage compartment close to your body to keep the batteries warm. The remote battery pack also removes weight from your head, increasing comfort. It features one Maxbright LED and four ultrabright LEDs. Four modes of operation offer run times from 200 hours on low to 2-1/2 hours on high. Adjustable elastic strap provides a custom fit. Runs on eight AA batteries (included) or lithium (not included). Waterproof to 1 meter. Weight: 14.7 oz. with batteries.