From the looks of it this is a pedal assist unit only. There is no throttle control. Looks like just a knob to control the percentage of assist. The unit is under powered at just 250 watts so you aren't going to get a lot of power out of it. True, the unit looks portable and as they claim, you can use it on a number of different bikes. But remember, you will need mounting hardware for each bike and that hardware does not appear to be available from their web site thus no idea of the cost of doing that. And speaking of cost, this unit seems quite high priced. Over $700 once you include the shipping fees. For around $500 you can buy an entire 1000 watt hub motor unit including a 48 volt lithium ion battery. Four times the power and double the top speed and range. Personally I can't see a single reason for selecting this option for creating an e-bike.