Backup power case with loudspeaker for iphone 4&4s

AP Music Case is specially designed for the functions of charging and speaker for iPhone 4/4S

Compared with iPhone 4/4S itself, AP Music Case brings higher sound volume and better sound quality

:Press this button to switch the volume between iPhone 4/4S and AP Music Case)

:Press this button for 3 seconds, the lights flickers from left to right one time,it indicates AP Music Case begin to charge iPhone 4/4S.  Press this button for 3 seconds again,  the  lights flickers from right to left,it indicates the charging is turned off. Besides. You can also know the battery capacity level by pressing this button.

Battery: 3.7V/1800mAh
Output Voltage: DC5 V±0.1 V 
Output Current: ≤700mA(0.7A)
Input Voltage: DC5 V±0.2 V
Input Current: ≤500mA(0.5A)
Charging Interval: 3~5h
Working Temperature: -10°C~50°C
Storage Temperature: -20°C~65°C