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People will find it very difficult when go downhill with a suitcase,since they cannot control speed and strength. LOCK is designed to solve this problem. In the bar of the handle,there is a braking system which is similar to bicycle brakes, gently press the brake handle when going downhill,the speed of suitcase will be controlled, in which way you can save your strength.
Chen Chao, Ye Wenjin, Sui Tingmeng, Xie Yasong