This customer is an avid vinyl records collector! He could only access part of his collection since he was unable to travel to the second floor of his home. We installed two straight stair lifts since he can safely transfer from one chair to the next at the landing. The SL 600 has a comfortable 19" W x 16" D x 18" H seat with a retractable seatbelt, and swiveling seat. The weight capacity is 350 lbs. In the event of a power outage, the unit can get up to 40 trips per charge on the back up batteries. Most importantly...this lift has a lifetime warranty that covers the motor, gearbox, helical gear, and gear rack! Our customer is thrilled to be able to now listen to all of his records with ease!