3 of 4 people found the following review helpful
5.0 out of 5 stars
Changes how I use the phone., 13 Feb 2014
Great device. I use my iPhone a lot on trains and on night shifts. Normally I go into power save mode, volume down, brightness down, no 3G use sparingly. But with this none of that happens.
This can easily double the life of your phone and is great value for it. Fully recommend.