The black juice pack air for iPhone 5/5s from mophie is a thin rechargeable external battery case designed to virtually double the usage time of your iPhone 5 or iPhone 5s. The rechargeable lithium polymer battery is concealed inside of a low-profile, lightweight plastic case and does not affect your phone's signal or electronics.
Once your phone is slid into the case, a connector at the bottom mates with the port on your phone. You do not need to remove your iPhone from the juice pack to charge. If you leave the case attached to the phone, both units will simultaneously charge. Toggle between charging and standby with the flick of a switch. Charge and sync the iPhone to iTunes without removing it from the juice pack air by using the included micro-USB charging cable. An integrated LED status indicator shows how much battery life is left and also indicates the charging status.
mophie's Smart Battery Technology instructs the iPhone to always drain out the juice pack air first. When the juice pack air has been drained, there is still a fully charged iPhone. The unit provides up to an additional 8 hours of talk time on 3G, internet use of up to 8 hours on 3G, 8 hours on LTE and 10 hours on Wi-Fi. You'll also get about 40 hours of audio playback and 10 hours of video playback. The juice pack air does not interfere with your iPhone's speaker, and redirects audio from the bottom of the phone to the front.