Ideal for all mobile devices in the car or at home.Includes 2 x AA and 2 x AAA Duracell Stay charged batteries.Stays charged up to 5 times longer vs. ordinary rechargeable batteries.Charges 2 or 4 AA or AAA rechargeable batteries simultaneously.Charges within 4-6 hours.Charges via mains or in-car using car adaptor.Over charge prevention - prevents cell damage.Sensor - charge termination based on in-built timer.USB power port.Capable of charging external devices through unplugged charger with fully charged batteries.