Features: This 18650 battery module feature Type C 5V charging/discharging capabilities with integrated boost circuit, offering easy convenience for portable power solution. Incorporates clear battery terminal and comprehensive protective circuits for safe operation in space constrained applications. Ideal for electronics enthusiasts, portable device manufacturers, and engineers requiring reliable power management in project or prototype development. Perfect for creating emergency charging adapter, powering gadgets during outdoor, or maintaining continuous operation of device in deployments. Engineered with ABS housing and professional grade components, this module deliver stable 5V output for smartphones, projects, and portable speakers while preventing overcharge/short risks. Specifications: Component:ABS Size: Approx.16mm/0.62inch Package Includes: 1Pc Protective Board note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.