A look at the Trek/Bontrager frame integrated DuoTrap ANT+ Speed/Cadence Sensor | DC Rainmaker
Change battery on Bontrager DuoTrap sensor (PLEASE SUBSCRIBE) - YouTube
Amazon.com : Overfly Hummer 20"x4"Fat Tire Electric Folding Bike for Commuter with 500W Bafang Motor, 48V/10.4A Battery, 7 Speed, and 6 PAS (Class 2) : Sports & Outdoors