Battery and case in one. Included USB cable charges the device. On/Off switch. Built-in overcharge, short-circuit and temperature protection. Provides extra battery life when on the go. Doubles the amount of time needed to rock, talk, surf, and text. Integrated LED status indicates how much juice is left.
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First off, let me address the "elephant in the room." I know everyone's complaint is going to be that the front speaker is gone (there used to be a slot in the front that filtered the speaker to the front bottom of the phone, but that was mainly for the days when the galaxy had a speaker in the BACK of the unit... its now at the bottom and with the mophie slot in the bottom the sound sounds ok to me... I can hear it just fine and I am slightly deaf on one ear...) that said...
the case itself is a very durable material that has a solid feel and it fits the phone like a glove. it feels very firm and feels that it will protect the phone very well in the case of a drop or fall. It does add a bit of weight to the device, that is the trade off for having a battery case; it does feel very comfortable to hold though, adding a "bump" in the back that conforms to the palm very well. the phone slides into the case very easily (getting it out is a small challenge, I use the camera opening in the back to push the device out and it just comes right out... but this case is built to never have to be taken out, it even can transfer data through the case). I rate the "case" portion as a 4 out of 5 due to the difficulty in taking it out and the "speaker in the bottom not the front issue ... (not a big deal, but it could have been in the front). For those asking, the edge screen is not affected by the case. I am able to get my edge screen popped up with no trouble, the case does not get in the way. I also have a liquid screen protector on it and it does not seem to buck the protector (though I was careful when putting it on).
Now for the battery part. It is spot on! I sat this on my wireless charger the night I got it (I have a nekteck) and it charged my phone first, then it charged the case. all in all, with my phone at 20% it seemed to charge in four hours total on the fast charge (that's two batteries almost completely drained). the third party wireless charger detected the case (and phone) instantly on seven out of seven tries of taking it off to check statuses and take calls through the evening.
the next day, when I needed to charge the device I hit the button on the back of the phone and it went to work charging. it charges the phone through the microusb insert on the bottom, its not fast charge but it seems to charge the phone from 50% in 45 minutes according to the phone. It can charge the entire phone from near zero to 100 percent btw. I was on 15% and it took me all the way.
hope that answers all the questions. This is a great case and a great buy. I wish it were twenty-five dollars cheaper though.