1900mAh portable battery pack for iPhone4s

Features:

1. Not just only a case, but also a backup battery
2. Emergency Helper when your iPhone lack of power
3. Good company to extend Talking, Video, Audio playback ect when large power consume
4. Power on/off button w/LED lights to indicate charge levels make for optimal effciency
5. Ultra slim design with high quality combination of UV and mold plastic to add more comfortable use.

Welcome to your inquiry!