In this video, we explore a compact **USB output step-up module** that can boost low voltages (as low as **0.9V**) up to a stable **5V at 600mA**—perfect for charging small devices from weak power sources like old batteries or solar panels. Learn how this module works, its applications, and how to use it in your DIY electronics projects. Whether you're into portable chargers, emergency power solutions, or just love tinkering with circuits, this step-up converter is a must-have! br br 🔌 **Key Features:** br ✔ Input: **0.