The C1 Mobile comes with a USB cable that connects to the charger, and also four converters which plug into the USB cable. These include a mini-USB, which doubles as a charger for the battery itself, and connectors for many other phone types. The nice thing is that the regular USB connects to the C1 Mobile, so for many, like myself, who have a phone with a micro-USB connector, I simply use my USB cable and it plug right in and I'm off and charging. I have a Droid 2, and the battery in the C1 Mobile is nearly as large as my cell phone battery, and given a bright light, you can expect a full battery charge in about 12 hours, so during the day, I could effectively nearly triple the amount of life of my phone.
The C1 Mobile is very small, and is also quite light, and subsequently very portable. One way I plan to use mine is to keep one in my car in the event that I have car trouble or get stuck in inclement weather and I don't have much juice left in my phone, or if I'm using my phone's GPS and I want to have some batter life at the end of the trip.
A red LED comes on one when it's being charged, the left LED turns on when it's being charged via the mini-USB port, and the right LED, as can be seen in this picture from the camera flash, when it's being charged through the solar panel. It takes about 3 hours to charge via USB cable, and up to 12 in bright sunlight with the solar panel.
The back has a nice pearl-white plastic casing which looks very nice. The whole charger is very solid and feels well put together. No cheap plastic creaking or slipping.
The mini-USB port on the left is used to charge the battery, simply take the provided USB cable, plug it into your computer, and then use the mini-USB attachment to plug it into the C1 Mobile. The right one is to connect a device to the charger, and when something is plugged in charging, the three LEDs show the battery level of the charger.