The standalone device has a built in motor, removable battery, and a set of rollers that make contact with the bike wheels and power the movement, rather than requiring a bike chain or wheel hub swap like advanced toolkits. You can attach the Oxiis fairly quickly and convert your bike into an electric accelerated version, then remove it just as easily when youre done. The Oxiis provides up to 31 miles of range with a top speed of 19 mph. The system is powered by an internal 158.4 watt hour...