brand new and high quality. Features: Small size, high power, high efficiency, easy to use. With memory function, it can save 10 groups of parameters which are free to retrieve. With advanced microprocessors, it allows precise adjustment of output voltage and current. Can set whether automatically output after power on.One for key to save current voltage and current values. With the indicators of output "OUT", constant voltage "CV" and constant current "CC", you can check the operating state in real for time. 4-digits digital display shows output voltage, current, power, capacity and other parameters in real for time by automatic or manual way. Constant voltage and constant current state. It can ensure the stability of the output voltage, even when the input voltage is higher or less than the output voltage. Specifications: Input Voltage: for DC 10 - 40V Input Current: 0 - 6A Output Voltage: for DC 0 -38V Voltage Resolution: 0.01V Current Resolution: 0.001A Power Resolution: 0.001W Capacity Resolution: 0.001mAh Conversion Efficiency: up to 92%(max) Working Temperature: -40 -85 Working Frequency: 150 KHz Material: Metal and Plastic Dimension: approx.10x8cm/3.94x3.15in Color: As pictures shown Quantity: 1 Pc Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x Step Down Module