The 5V Step-Up Power Module with Lithium Battery Charging Protection Board (Model 134N3P) is designed for DIY USB chargers and portable power supply projects. It integrates a boost converter and battery charging circuit with built-in overcharge, over-discharge, and short-circuit protection. This module efficiently boosts the battery voltage to a stable 5V output, suitable for powering USB devices. It supports lithium battery input and provides safe, stable performance for electronics enthusiasts and hobby projects.