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BZ Series E-bike kit
link address: https://www.alibaba.com/product-detail/High-Quality-LVBU-BX30D-36V-250W_62312779678.html
link address: https://lvbutech.en.made-in-china.com/product-group/WqTQAZNoALhX/Bx-Waterproof-Series-catalog-1.html