This DC-DC automatic buck boost converter module supports a wide DC input range from 3V to 20V, making it suitable for various power sources such as batteries, adapters, and USB power supplies. The module can provide commonly used stable output voltages of 5V, ideal for powering microcontrollers, sensors, LED strips, routers, and other electronic devices. With its built-in automatic buck-boost control, the converter can step up (boost) or step down (buck) the input voltage to maintain a stable output, even when the input voltage is higher or lower than the set output voltage. Specially suitable for lithium battery power systems, this module ensures stable output as battery voltage drops during discharge, effectively extending usable battery time and improving system reliability. Designed as a compact and efficient power supply module, it offers low heat generation and reduced power loss, making it perfect for continuous operation in DIY electronics, prototyping, and embedded applications. Color: As Shown Material: PCB Package Contents: 1*Adjustable Lithium Battery Boost-Buck Constant Voltage Power Supply Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.