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Sitop is an aid equipped in a wheelchair. This product helps disabled people on wheelchairs go uphill or downhill easily while ensuring their safety. Its specialty lies in the fact that when a user on a wheelchair navigates on a flat ground, he or she can move back and forth; moreover, when the user encounters an uphill topography, it is not always necessary to seize the wheels. When the user relaxes his or her grip, the latch structure in the aid will brake the wheel to prevent the wheelchair from moving backwards. Additionally, when the user rolls downhill, the anti-skid system in the aid also helps prevent unintended acceleration.