Only via AAA battery, and 15 minutes for charging could Keep 9-10 hours energy ortalking for 45 min Only via AAA battery, and 15 minutes for charging could Keep 9-10 hours energy or talking for 45 minutes, so it would be very convenient for your tour. Meanwhile, it is with very large area for showing your logo. With Key-ring .

Emergency Cell Phone Charger Via 4XAAA battery