Charge Anywhere: Charging cords are not needed, just plug directly into a USB computer port, wall block, battery pack, etc. Charging Light: Red light indicates the battery is charging, Blue light when it's fully charged. Save Money: Each battery gives you over 500 charges, saving hundreds of dollars.
Specs: Battery Type: AA Rechargeable USB, NiMH Includes: Plastic Carrying Case Input Source: USB Capacity: 1450mAh Compatibility: USB 2.0 and USB 1.1 Weight: 3.1 oz (4 batteries with case) Strength: 1.2 Volts