1. Dual battery packs switch parallel batteries to increase capacity Dual battery connectors 2. The dual battery balance discharger can manage two battery packs fixed on the bicycle, low power consumption, low power consumption design, real-time detection of the voltage of the two battery packs, and online battery check. 3. This module can let two batteries discharge together to power the electric bicycle, it will automatically compare the voltage of each battery and adjust the current output of each battery. Colour:As Shown Material:Metal+Plastic Package Contents: 1 * Battery management module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.