It's rechargeable high-capacity battery is compatible with many devices, with a USB (Universal Serial Bus) output for use with other charge cables. The 2.1 A output is perfectly designed for charging tablets, & the LED indicators show the amount of charge remaining. Long Standby The long standby time means that you can keep handy for emergencies, & the compact design is convenient for storage. Compatible with most USB (Universal Serial Bus) devices USB (Universal Serial Bus) devices compatible including Apple iPhones, iPads & iPods, when connected to their USB (Universal Serial Bus) charge cable (not supplied). Specifications Battery technology: Lithium-Ion (Li-Ion) Battery capacity: 4000 m Ah Charging source: AC, USB (Universal Serial Bus) Battery voltage: 5 V Output voltage: 5 V
Colour: Black LED indicators Battery voltage: 3.7 V