For hospitals, emergency centers, fire, emergency ambulance, family. Hauling goods up and down the stairs. The stair stretcher is mainly used for high-rise buildings transfer. Patients up and down stairs. Extra wide sliding system for safer and easier transfer. The materials of stair stretcher is made of high-strength aluminum. Castor sizes of stair stretcher:125/100mm, rear castor with brakes. The sliding system adjustable, the user can adjust the tightness. Three position lift bar help any size operator move the stair stretcher. Headrest, IV pole, oxygen holder optional. Maximum Load Capacity: 350lbs (160kg). Rate: about 40-55 steps per minute. Scope of application: step length? 80cm. Motor Power: 120W (high quality, almost no noise). Fully Charged Time: 2 hours (equivalent to 15 floors up and down 15 times). Expansion Size: 39.7-61.81in/110-160CM (±3.5cm). Folded Size: 42.9118.912.2in/1094831CM (±3.5cm). Unfolded Size: 53.1518.961.81in/13548157CM (±3.5cm). Product Weight: 63.8lbs/29±2kg. Service Life: 3-5 years. Battery: 24V 13.6Ah(MAX) Lithium Battery (External Battery). WARNING 1 Never leave an evacuee unattended in the Stair climber and always use restraints. WARNING 2 Avoid changing the position of the rapidly, as this may result in an injury to the evacuee. Support the stair climbing wheelchair while. WARNING 3 Improper maintenance can cause injury. Maintain the stair climbing wheelchair only for the purpose described in this manual. WARNING 4 Cannot turn at corners-This product cannot be used in spiral staircases, curved staircases steps and trapezoids with a slope of 50° or greater are rough and uneven. Domestic orders usually takes 1-5 days to arrive.