Rays has your Back! With this Powerbank - 5200 mAh External Backup Battery to Recharge Your Gadgets on the Go! Provides approximately 2.5 charges for most phones. Four Bar LED charge indicator. Micro USB input charging port. USB output port. Cables not included. Weighs 4.9oz. Dimensions 6 1/8 x 1 1/4 x 7/8 inch. Capacity 5200mAh. Output 5V 1.5A.

Nominal voltage: 3.7v each

Capacity: 2600 mAh (Dual batteries 5200 total)

Max charge current: 1CmA (2600 mAh) each

Protection kicks in: 2.75v and 4.2v

Over-charging / Draining at 4.2v / 2.75v

Size 18.45mm x 67mm

Weight: 50.5g each