It's like an electric conversion kit that comes on and off your bike, but can carry stuff, too. Some info from the website...
The rider chooses the amount of “boost” applied to the bike through an easy throttle action.
Power assist up to 19 mph (less than 20 mph is legal for all bike trails and...
I believe electric bikes will become more popular in the US soon - the "cheating" aspect is still hindering on our minds, when in reality e-bikes are helping more people realize there is a way to commute or run errands without stepping foot in a car.