Curved rail :Steel
Straight :Aluminum

-Swivel 
-Armrests foldable
-Electronic Retrractable safety belt
-Seat Pad
-Timer
-Battery
-Toggle switch
-Sensors
-Lcd 
-Remote Call
-Intelligent Lcd
-0.12 m/s
-Can choose Seat /Color
-Dc motor
-High efficency low noise motor
-Max 120-160kg
-3 year warranty