HP-K12 Ambulance Collapsible Stretcher Automatic Loading Stretcher Height Adjustable1. The main material is high strength aluminum alloy which is hardened and surface treated; 2. The overall height of the stretcher can be adjusted by 23 gears, which is convenient for CPR operation; 3. The front leg height can be adjusted by 2 gears, and the rear leg height can be adjusted by 3 gears; 4. The backrest is controlled by an air spring to adjust the Angle,angle of the back: 0 88; 5. The legs are mechanically supported to change position 0