rinciple of equilibrium: This module is adjacent differential pressure equalization. The adjacent battery voltage difference reaches 0.1V or more. The internal trigger equalization work is performed. Until the adjacent battery voltage difference stops within 0.03V. There is adjacent pressure difference when charging and discharging on the battery pack. Trigger equalization. The battery pack voltage error is also pulled back to the desired value. Reduce battery maintenance costs. Balanced version features: High-precision energy transfer equalization. Exclusive equalization IC. High current 1.2A energy transfer battery voltage balancer. Significantly balance battery voltage. Improve overall battery pack efficiency. Material:metal colour:As shown Package Contents: 2 * Active Balance Board. 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.