1900mAh External Battery Charger for iphone 4 4S Portable Battery Case Backup Charging Cases Battery Power Cover Charge

For iPhone 4 4S External Battery Charger Case Portable Backup Battery 

There is an interface in backup battery. Insert the phone down the chute till match the interface completely， and then you can start the cell phone charge and also use it as a battery directly. There is a space for camera outside， so the entertainment function of the mobile phone wont be affected. There is a slide switch and a USB interface on the top. The role of the slide switch is to start or stop a backup battery charging for iPhone. And the function of the USB interface is to charge the backup battery and for iPhone at the same time via the data.transmission， and also you can read the photos that you have taken in the camera.There is a round switch and four LED lights. The round switch is to check the power of the backup battery. Press the round switch lightly， and then the LED will shine. All four LED shining shows that power is enough. On the contrary， the backup battery needs charging. LED will shine in the charging process， and they will get more and more bright from the charging beginning to the charge end.

Cell type: Li-ion;

Cell output voltage: DC5V±0.2V;

output current: ≤500mA0.5A;

input voltage: 5.5V±0.5V;

input current: ≤1000mA1A;

Capacity: 1900mAh;

Duration of charge: 3-6 hours;

cycle life: 500 times;

working temperature-1040storage and transport Temperature-2050;

Volume: 114x66x20mm;

weight: 193g

Package Included