There are 3 versions - Avento HighLow Ergo-line with central brake (ref. 13590) - Avento HighLow Ergo-line with individually braked castors without cover cap and footrest (ref. 15610) - Avento HighLow E-move with central brake electrically adjustable with handset (ref. 16655) The Avento HighLow seats are adjustable in height thanks to a hydraulic pump or handset: - Avento HighLow with central brake: 52 to 80 cm (seat height) - Avento HighLow with individual brakes: 48 to 76 cm (seat height)