Original sentence: Many other input devices can be used if the wheelchair user lacks coordination or dexterity of the hands or fingers or cannot use the hands at all.Powerchairs or "electric wheelchairs" use electric motors instead of manpower.The user typically controls speed and direction by operating a "joystick" similar to that found on arcade video game consoles.They are usually powered by deep-cycle batteries similar to those used to power outboard boat engines
Edited sentence: A powerchair is ideal for navigating tight spaces indoors and can often turn 360 degrees in the same spot.Powerchairs are extremely maneuverable because they're controlled with a joystick device you can operate with as little as one finger.Powerchairs can be easily customized to accommodate the rider's specific situation