Works as advertised. I averaged 2.7 full charges with the unit (iPhone down to 15% to start in each case). I think you can recharge the New Trent IMP500 with either the ac adapter that comes with it or the apple iPhone adapter (both are 5V 1A). You will need your iPhone usb cable to charge your iPhone once the IMP500 is charged up. I would recommend this product because it works as advertised, appears to be well made, and the price is reasonable.