Features: 1. All models have USB ports, which can charge mobile phones. 2. All models are micro-switching DC power supplies. 3. We have two colors for all models, black and white, you can contact customer service according to the color you want. 4. The output voltage and current can be controlled and adjusted by variable resistors, which provides more convenience and accuracy for the adjustment of voltage and current. 5. The panel also provides high-precision two/three-window digital tube displays of voltage, current, and power, allowing users to intuitively see the current state of use and various parameters of the machine. 6. Small size, light weight and high power density. 7. Constant voltage and constant current automatic switching. 8. Voltage, current, power LED display, high precision, with the characteristics of voltage stabilization, current limiting, and simple operation. 9. Adjustable output voltage and current: output voltage and output current can be continuous 5. Adjustable between 0 and nominal value, with fine adjustment and coarse adjustment 10. With over voltage protection (OVP), over current protection (OCP), over temperature protection 11. Temperature controlled fan cooling, low noise and long life. 12. The output voltage range is continuously adjusted from 0 to the rated voltage. 13. The output current range is continuously adjusted from 0 to the rated current 14. AC 110v or 220v can work, rest assured to choose. 15: Full metal body and more compact size, light weight, easy to carry Product use: 1. Production line testing. 2. Mobile phone repair, computer repair, electrical repair, car DVD, car audio. 3. Product aging and electroplating, such as resistors, capacitors, relays, DC motors, LEDs, etc. 4. Charge the battery. 5. Laboratory, scientific research and teaching, factory, maintenance power supply, school laboratory scientific research production line use 6. Other occasions requiring DC power supply. 7. Use of Arduino project 8. Light bar power supply, car battery use 9. Use of Arduino and DIY electronic projects