Original Mi Band 4 charging cable. What good is your Xiaomi Mi Band 4 fitness activity tracker if the battery is dead? To ensure you're always prepared, order the original Xiaomi charger for the Mi Band 4 and keep it at home, in your car, or in your gym bag. Charge your Mi Band 4 quickly and conveniently via USB using the original Xiaomi charger on your laptop or PC. The original Xiaomi charging cable for the Mi Band 4 is made from high-quality magnets and environmentally friendly materials.