尼日利亚采购需求：直流电源、直流开关电源、接地电阻测试仪、绝缘电阻测试仪、直流低电阻测试仪、数字电桥

I'm looking for a black electric bike that has the capability of covering a good distance each day. Ideally, it should be able to travel up to a specific range of kilometers without needing frequent charges. Features like a reliable battery, comfortable seating, and efficient performance are a must. Additionally, I'd like to know about the bike's speed, weight capacity, and any other key specs that would enhance its daily usability. If you have models that fit this description, please provide details on pricing, availability, and any potential customization options. Looking forward to your response!