Plug in your GPS or emergency satellite phone to the Brunton Sync Power Reservoir on your next expedition. This two-piece battery pack includes the battery and a control module with outlets to give juice to your backcountry gadgets. The module clips to a shoulder strap, allowing you to check the remaining power with built-in L.E.D. indicators, while the bulkier battery tucks away into your pack. The durable, water-resistant rubberized shell handles a light sprinkling. Auto shut-off saves precious power when the Sync isnAAAt in use. The system completely charges in four hours at home or in your car, and it even charges off a computerAAAs USB cable in around sixteen hours.