Input port: DC socket and terminal block, each way makes the module work normally, and it can also be connected at the same time; Output port: USB and terminal block, can output power at the same time. High-efficiency voltage transformation: The module adopts technology synchronous rectification, which obviously improves the conversion efficiency and expands the working voltage and current. Mini portable: Suitable for narrow installation spaces and small enclosures. Application: As a USB 5V step-down converter, DIY mobile phone charger, modified car charger, power supply for b. Application areas: household appliances Material:PC+metal colour:Blue Package Contents: 4 x Buck Converter 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.