Features: Aluminum alloy bracket, ultra-light and rust-proof The armrests and footrests can be opened for easy passage over the bed The small rear wheel and emergency power-off switch for back-up prevention make it safer to use Lithium battery has a long life, three times longer than ordinary domestic batteries Seat cushion and backrest are waterproof and breathable tarpaulin 1 year machine maintenance, except for man-made damage (excluding lithium battery)