Many people may already be familiar with this product but there may be some that are not. This is a powered handcycle that can be attached to a manual wheelchair and turn it into an electric trike.
Made by Rio Mobility of San Francisco California, the Firefly is basically a wheel, handlebars, and electric motor. Attached to a wheelchair, the Firefly can go up to 12 mph and 15 miles. To see the Firefly in action watch the video below and visit this link.