The app comes with a lot of nifty features. You'll be able to:
See available bikes and locks in the area.
Unlock bikes when you are close to a station,
See how long you've been riding
Report a bike as broken after its parked
See how many trips you have in total, and how many stations you have visited
Get a confirmation when your bike is parked.
If you've activated extended rental, you'll get notified before it kicks in.
You'll also see how much you've paid for the trip.