Features: brand new and high quality Suitable for repair and replacement of BMS module of MAX G30 electric scooter lithium battery, with communication protocolThe firmware can be updated online. The MAX G30 original model battery has a built-in communication signal with the controller. Self-made batteries or ordinary battery packs cannot enable the MAX controller to obtain the communication signal, so the controller refuses to work for safety. Using this battery for protection module can allow the battery pack to communicate with the controller normally and drive the electronically controlled vehicle to work. It can protect the safety of battery charging and discharging. Durable and easy to use. Specifications: Material:PCB Size:Approx.7x6.2cm/2.76x2.44inches Color:Blue Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set Battery BMS Module