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A Wall dock battery charger with a USB port,you can charge by a usb line or power outlet, you can charge your phone and spare battery at the same time.Also,you will get three 3000mAh batteries

Product Features
Suitable for Samsung Galaxy S IV S4 i9500

Charger
Rapid charging to full capacity
Safe charging with over-charge protection
USB Port output and battery charging at the same time
Talk and charging at the same time, no influence to signal.
Compact design, easy to carry
More convenience to interchange your standby batteries.
Input:Ac 100-240V~50/60Hz 0.15A
Output:Dc 4.2V~350mA~+-50mA
USB 5.2V d.c.800mA
US Plug (SA adapter included)

Battery
Back-up power for your mobile phone.
Replacement for missing or bad battery.
Rechargeable for recycle usage.
Dual IC chips protection, anti overcharge, anti over current, anti short circuit.
Passed CE/ Rohs certifications.
Cell type: lithium-ion
Capacity: 3000mAh
Voltage: 3.7V

Package includes
1x USB Travel Charger (SA adapter included) For Samsung Galaxy S IV S4 i9500 
2x Battery For Samsung Galaxy S IV S4 i9500