Ultra slim: Folded size of only 275 mm, the smallest profile on the market to keep the unit out of the way when not in use. Quiet, smooth-riding operation: From the rack and pinion drive system. Battery operated: Built-in charging on the top and bottom of the rail so the chair can be used several times even through a power failure. LED status light on unit: To advise of any common issues. Obstacle sensor system: On the carriage and footrest to stop the chair if it meets an obstacle. Safety features: Swivel and lock seat at top landing, retractable seat belt, anti-slip footrest, obstacle sensors. Easy operation: Includes 2 infrared remote controls plus toggle switch on arm rest. Comfortable and durable seat: With width-adjustable arms up to 508 mm wide, easy-clean vinyl seat. Flexible configuration: Can be installed on either side of the stairs. Master shut off: Will turn off if not used for an extended amount of time. Warranty: 36-month manufacturer’s parts warranty.