Veho Pebble Explorer Portable Power Bank | 8,400mAh | Smartphone and Tablet Charger | iPhone Charger | Samsung Charger | Dual USB | Battery Pack - (VPP-005-EXP) Powerful 8400mAh portable and rechargeable battery for tablets, smartphones and USB rechargeable devices Dual 2.1 Amp USB outputs designed to charge tablets and smartphones fast and efficiently.Output 5V/2.1A Digital LED indicator giving exact percentage charge available Auto shutoff mode to protect against short circuit, over-current, over-charging, and over-discharging 8 hour charge time will give weeks of portable battery life for multiple devices (iPads, iPods, Kindle, Samsung Galaxy, iPhones, smartphones, etc)