Manufacturers offer a variety of other features and accessories.  Most scooters are equipped with a key lock for turning the scooter on and off, a battery-level indicator, and a proportional speed controller to limit maximum speed. 

Available accessories include crutch and cane holders, oxygen carriers, front and rear baskets, trailers, headlights, tail lights, horns, and canopies. 

Some manufacturers even offer sidecars to allow an additional passenger.

As when purchasing a car, options add to the cost of the scooters.  Accessories should be evaluated in light of how they contribute to maximum user independence.  At the same time, it should be kept in mind that some options may decrease battery life, maneuverability, and travel range.

Source: ABLEDATA Fact Sheet on Scooters