Rechargeable external battery and snap case.
The Juice Pack Air offers you the convenience of a fully protective, form-fitting case with an extended built-in rechargeable battery for your iPhone 4; all in an ultra-thin, lightweight, low-profile design.

• Virtually double your talk and listening time
• Ultra-thin, lightweight, low-profile design
• Rechargeable 1500mAh Lithium Ion polymer battery
• Two-tone, metallic and soft-touch, finish
• Fits all iPhone 4S and iPhone 4 models.

Features
Virtually double the time you have to rock, talk, surf, and send by toggling between Charging and Standby with the flick of the Juice Pack Air's switch. The Juice Pack Air also gives you complete protection from top to bottom. No more choosing between protection and power. And the open-top design means you can use any headphone jack.

Highlights
• Complete iPhone 4 protection from top to bottom
• Open-top design lets you use any headphone jack
• Rechargeable Smart Battery concealed inside of a low-profile, light-weight, soft-touch case
• Toggle between Charging and Standby with the flick of a switch
• Certified "Made for iPhone" product
• Integrated four-light LED status indicator to show how much battery is left
• Pass-through design and USB cable to charge and sync with iTunes without removing iPhone from Juice Pack Air
• Smart Battery Technology instructs the iPhone to always drain the Juice Pack's battery first

Dimension
• Height: 0.68 in./1.73 cm
• Length: 5.07 in./12.88 cm
• Weight: 2.32 oz./65.77 g
• Width: 2.51 in./6.38 cm