The devices come in a number of variations where they can be propelled either by hand or by motors where the occupant uses electrical controls to manage motors and seating control actuators through a joystick, sip-and-puff control, head switches or other input devices.
ðə dɪvˈaɪsᵻz kˈʌm ɪn ɐ nˈʌmbɚɹ ʌv vˌɛɹɪˈeɪʃənz wˌɛɹ ðeɪ kæn biː pɹəpˈɛld ˈiːðɚ baɪ hˈænd ɔːɹ baɪ mˈoʊɾɚz wˌɛɹ ðɪ ˈɑːkjʊpənt jˈuːsᵻz ᵻlˈɛktɹɪkəl kəntɹˈoʊlz tə mˈænɪdʒ mˈoʊɾɚz ænd sˈiːɾɪŋ kəntɹˈoʊl ˈæktʃuːˌeɪɾɚz θɹuː ɐ dʒˈɔɪstɪk, sˈɪpændpˈʌf kəntɹˈoʊl, hˈɛd swˈɪtʃᵻz ɔːɹ ˈʌðɚɹ ˈɪnpʊt dɪvˈaɪsᵻz.