Powerocks Black Rose Stone Universal 5200mAh Extended Battery This is a rechargeable universal 5200mAh lithium ion extended battery Dual USB output allows for charging two devices at the same time This battery is portable and lightweight Will charge a standard smartphone 3-4 times and it will also charge other digital devices such as Bluetooth headsets, cameras, GPS devices, tablets, and more depending on device charge requirements. Battery status is indicated by the LED lights on the end of the Rose Stone. 4 lights = 100% full, 3 lights = 75% full, 2 lights = 50% full, 1 light = 25%