Features: This automatic boost/bucking converters lithiums battery charging module delivers adjustable constant current/voltages output (5V 30V input) with 95% efficiency, ensuring charging for diverse Liion/LiPos applications. Engineered with wide voltages input compatibility (5V 30VDC), integrated over voltages/current/temperature protections, and LED status indicators for realtime monitoring. for electronics enthusiasts, maker, and technical professional requiring precisions charging for models, solar systems, or powerbanks. for laboratory testing, field equipment maintenance stations, and portable power management setups where voltages conversion. ABS+aluminum housing withstands workshop conditions while maintaining 0.01V voltages regulation accuracy across full load ranges. Specifications: Materials: Plastic + Metal Size: 6.6x4.8x2cm/2.6x1.89x0.79inch Package Includes: 1PC bucking Boost converters Module 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. Thank you!