The Mophie Juice Pack Plus Outdoor Edition Battery Extender for iPhone 4/4S keeps your iPhone powered up for more than twice as long as normal. Plus, it's designed for outdoor use and features the Outdoor Wayfinding App. Just pop your device into the pre-charged case and the iPhone's battery life extends up to an additional 16 hours for talking, 11 hours for Internet, 11 hours for video playback and 44 hours for audio playback. The Juice Pack Plus is a rechargeable battery pack and features a Standby/Charging Switch that eliminates any wasting of battery power through unnecessary use.
It also comes with a USB cable for charging and syncing your device while it's in the Juice Pack Plus. Besides battery power, the case also provides acoustic sound enhancement by redirecting the audio to the front of the iPhone. It also provides an LED that indicates the status of the external battery's life. The Juice Pack Plus even features a protective rubberized impact band, which provides a comfortable ergonomic design with the complete protection of a dual-injected hard shell case and protective shock-proof rubberized band.