The Varta USB Duo charger comes with 2x AAA 800 mAh batteries. The charger is able to charge up to 2 AA or AAA rechargeable batteries in 7 hours. Elegant VARTA design with blue LEDs for charging indication. Global voltage of 100-240 for worldwide use and advanced safety. USB duo charger charges AA and AAA batteries Includes a microUSB input Features a safety timer (10 hour) , wrong polarity and short circuits Can detect unsuitable or defective battery cells Includes 2 AAA 800 mAh Recharge Accu Power batteries Can charge 2x AA or AAA batteries in 7 hours Blue LEDs indicate charging