Features a Charge Switch for Charging Only When Needed

The "Juice Pack Air" is an "Made for iPhone" certified product, guaranteeing it meets Apple's performance standards. It has passed rigorous inspection criteria, including radio frequency interference when attached and fitting with the iPhone 4, and features a meticulously designed layout that accounts for the iPhone 4's button shapes and speaker positions.

The internal battery boasts a large 1500mAh capacity, extending iPhone usage time to up to 270 hours on standby, 6 hours of talk time, 5 hours of data usage, 36 hours of music playback, and 9 hours of video playback. It also includes a charge switch that allows you to charge your iPhone 4 only when necessary. When the iPhone's battery is full, simply turn the switch off to prevent unnecessary power consumption from the internal battery.

The product's surface is finished with a pleasant-to-the-touch rubber coating, while the outer edge features a silver outline, mirroring the iPhone 4's design, as an accent. You can charge or sync with your computer while the case is attached. At an ultra-slim 69g, the "Juice Pack Air for iPhone 4" fits perfectly in your hand and feels like part of the phone itself, so much so that you might forget it's even there. With this, you can enjoy your iPhone 4 without the worry of a depleted battery.