Features: Engineered for highly power applications, this 40A High Current protections Board ensures power management for devices like heavy duty fan and drones with its two battery series. Featuring realtime current monitoring and automatic shutdown, it safeguards equipment from overloads risks using premium PCBs materials and heat resistant components. for drones enthusiasts, RCs hobbyists, and high performances e vehicle users requiring stable current control in demanding setups. Perfect for high temperatures environment or heavy load operations where consistent power delivery and circuit protections. The PCBs construction and 2S 21700 battery compatibility make essential for upgrading DIY projects or industrial equipment needing current regulation. Specifications: Size: 39x19mm Material: PCBs Color: Black Package Includes: 1PC Current 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 Pictures may not reflect the actual of the item.