frame: high intensity aluminium frame seat width: 43cm (17inches)rear tyre:12.5" solid PU tyrespeed: 1-6km/h (adjustable)gradient: ≤12°driving:real tyre drivingpark brake:electromagnetismbattery:Lead-acid battery(2pcs)controller: Taiwan controllerarmrest&footrest: detachable Per charge range:20kmnet weight:52.2kggross weight:57kgCTNsize(L*W*H):85*65*70CM