The Targus Backup Battery for iPad is a 5.0 V, 2.1 A output battery that allows you to charge your iPad or Smartphone whenever extra power is needed. Just connect the backup battery to an iPad or any Smartphone to continue calling, game playing, web surfing or movie watching. Featuring 4800 mAh of battery capacity, the battery provides users with an additional 5 to 10 hours of use on iPad and can fully charge a Smartphone 3 to 5 times on a single charge. For rapid charging, the battery is compatible with Targus USB Fast Charger. The battery features a 4 level LED battery level indicator so users are never left without power. The thin and compact size is portable and can be easily packed away into luggage for easy travel.