Boustexternal Backup Battery Pack Case Charger for iPhone 4 Bst-Aahu

External backup battery pack case charger for iPhone 4
For iPhone 4 4G external battery charging case
Full body coverage protection for your iPhone
Works as both an extended iPhone battery set and a protection case
Slimmest iPhone battery case ever made
Brand new/ super hot! !
Free USB cable included
Features:
Smart battery (optimized to lengthen your iPhone performance time; No more out of power dilemma during important phone coversations)
Full body coverage for iPhone4
Lightweight, thin design (low profile)
Non slip comfort grip
Automatic tests function
High-quality li-polymer cell
Extended battery pack - 1900 mAh
On/off button for optional power output control
Four LED lights indicates the power level remaining the case (each light represents 25% of remaining power)
Sleek, low-profile design; Rechargeable up to 1000 times
Specification:
Fully charged in 3 hours
Battery type: Lithium-ion polymer battery (way better than lithium-ion batteries).
Output voltage: DC 5V
Output current: 1900 mh
Output: 5V
OEM version/retail gift box package, iPhone4 USB cable included.
Please make sure to charge your battery case for at least 8 hours before first use to achieve maximum performance
Compatible: For iPhone 4 4G
Package included:
1 X iPhone 4 external battery charger case(without retail package)