FOUR PARTICULAR TECHNOLOGY:A.The lightest:20KGS ( WITH 2PCS LITHIUM BATTERY)B.The smallest:ONE BUTTON FOLDING (V: 0.25 M³ ONLY)C. The farthest mileage:TRIP 30KMS AFTER ONE TIME CHARGINGD. The most energy-saving and environment-friendly:NEWEST TECHNOLOGY OF BRUSHLESS MOTOR BE USED Here´s the website that you can see how the newest wheelchair was foldhttp://www.wheel-chair.cn/cn/cases/7.htm If you have any question, please do not hesitate to contact with me immediately. Hope we can well cooperate in near future.