1: The main functions are: overcharge protection, overdischarge protection, overcurrent protection, short circuit protection, Drop protection,temperature protection, etc.2: Can 3S to 24S series solutions, 5A to 200A working current customization. Different voltages and currents. There are different parameter details. If you need to confirm. communicate with the seller to confirm that the data is accurate.3: The use of top-level (A-level) protection integrated circuit IC, from industrial automotive-level solutions. BMS is made of high-quality Mos and IC.4: Double-sided PCB circuit board, high anti-corrosion, high waterproof, high impedance ESD conformal coating. Silicone plate + aluminum plate double-layer heat dissipation. Three anti-glue + insulation sheet, double-layer electrostatic insulationMaterial: PC+Metalcolour: As shownPackage Contents:1 x protection boardOnly 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.