By 4 blue flashing LEDs, allowing the battery level reading / estimate and the connecting cable (micro USB), which is incorporated by its sides, I find very convenient. Operation is simple and the iChoc has roughly smartphone size, so you can also keep it together with the smart phone still in his hand and go on when the battery is at the end.
The Power Bank fits perfectly due to the built-in cable for the Sony Xperia Z1 and HTC One. Mainly I use them at present but for the iPhone 5, because I often use the Bluetooth connection, and thus the battery runs out quickly. She manages to charge the iPhone 2x sequentially. After the Power bank is almost empty and (both not included) must itself again via micro-USB cable or charger suitable to be refueled. I'm making the most overnight, because that takes a few hours.
If the charging time (about 2.5 hours.), Capacity and processing and the iChoc is nice handy so that it can be used well on the road and stuck sometimes in your pocket. Definitely a worthwhile purchase.