Features: Ensures the absolute safety of your 3.7V Lithiums batteries with 1S 3.7V 4A 18650 Charging BMSs Protections Board, featuring overcharge, over discharge, overcurrent, and short Circuits protections. This well board for various shapes of Lithiums batteries and integrates seamlessly into low cost applications, meeting diverse performances requirements. for enthusiasts and professional who require battery management for their electronic projects or devices. for where maintaining battery integrity, such as electronics, portable powerbanks, and battery pack. With 2 channel output, this Protections board enhanceds efficiency by powering two devices simultaneously, making it addition to any electronic toolkit. Specifications: Materials: Electronic components Size:35x4x2.2mm/1.37x0.15x0.09inch Package Includes: 1PC Battery Protections Board note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the picture may not reflect the actual of the item.