White Extended Battery Case for iPhone 4 Apple Certified 30-Pin Connector Built-in Battery + Protective Case + Signal Problem Fix Fully Support Charge and Sync with Case On Smart Switch, Gain more control over charging to enhance Safety Accurate LED power indicator, flashing when battery runs low Perfectly design, offer a full protection only for iPhone 4 Battery Capacity: 1700mAh Standby Time: &gt; 210 Hours Call Time: &gt; 5 Hours (3G) / 10 Hours (2G) Browsing Time: &gt; 5 Hours (3G) / 7 Hours (WiFi) Music Time: &gt; 28 Hours Video Time: &gt; 7 Hours