Input port: DC socket and terminal block; each connection method allows the module to function normally, and both can be used simultaneously. Output port: USB and terminal block; power can be output from both at the same time. High-efficiency voltage transformation: The module uses synchronous rectification technology, which significantly improves conversion efficiency and supports a wide operating voltage and current range. Compact and portable design: Suitable for tight installation spaces and small enclosures. Application: Functions as a USB 5V step-down converter; ideal for DIY phone chargers, modified car chargers, and powering devices. Application areas: Household appliances Material: PC + metal Color: Blue Package Contents: 2 x Buck Converter Module Note: The package includes only the items listed above; other accessories are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual product. Measurement error allowance is +/- 1-3 cm.