Features: This PFM controlled boost converters module efficiently steps up input voltages from 0.9V-5V to stable 5VDC output (500-600mA), for charging USB devices like phones and cameras while safeguarding against overloads and short circuits. USB female port integrates seamlessly into projects or mobile powerbanks, featurings builts in protections circuits for safe operations. Perfect for electronics hobbyists, enthusiasts, and engineers designing portable power for microcontrollers, digital gadget, or lithiums battery baseds systems. Embeds into solar powereds chargers, emergency powerbanks, or robotics projects requiring stable 5V outputs, for low voltages sources like single cell batteries. Each pack includes 10units, offering versatility for prototyping, backups, or distributed power systems in IoTs devices and wearable . Specifications: Materials: Size: 3.5x1.6cm/1.38x0.63inch Color: Blue Package Includes: 1PC voltages Regulator 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.