brand new and high quality Features: Made of high quality material, solid, durable and good performance, long service life. A voltage regulator that no matter the input voltage is lower/higher than output voltage, the output voltage can be stable. It integrates analog adjustment and digital control, and shows the preset voltage/current/power and so on in real for time. Large high definition LCD with 160wide viewing angle, easy and comfortable reading. It features both hardware and software for protection, safe to use. The screen supports 4 way rotation, convenient to use. It also has night rest screen mode, suitable for any conditions. for Smart temperature control fan, thickened radiator, 2 way ventilation, great cooling effect. It also can used as a common voltage Buck-Boost power supply with over-voltage/over-current/over power/over temperature/under voltage for protection. With constant current function, it can charge the rechargeable battery within 0.6V-36V. Boost Step Down Converter only, other accessories demo in the picture is not included! Specification: Material: ABS, Electronic Components Size: app.7.9 x 4.2 x 4.1cm/3.11 x 1.65 x 1.61in Color: Black Quantity: 1 Pc Product Parameters: Input Voltage: for DC 6.0-36V(Limit low voltage 5.5V, limit high voltage 38V) Output Voltage: for DC 0.6-36V Output Current: 0.000A-5.000A Output Power: 80W Input Current Limit: Max.7A Current Resolution: 0.001A Voltage Accuracy: 0.3% + 1 byte Current Accuracy: 0.4% + 3 byte Capacity: 0-999999Ah Energy: 0-999999WH Time: 0-1000 Hours Hardware Protection: Output short circuit for protection, short circuit without burning, output anti-backflow, can directly charge the rechargeable battery, without additional anti-backflow diode. Software Protection: Over voltage for protection(OVP), over current for protection(OCP), over power for protection(OPP), over temperature for protection(OTP),input under voltage for protection(LVP), power chip self for protection(OEP). Tips: Requirements for full load output power supply: input power supply optional 15-35V, power above 100W Charging Steps: 1. Determine the floating charge voltage and charging current of your rechargeable battery; (if the parameter of lithium battery is 3.7V/2200mAh, the floating charge voltage is 4.2V; if it is 12V rechargeable battery, generally set the floating charge voltage to about 14V) 2. Under no-load condition, set the output voltage to floating charge voltage; (if 3.7V lithium battery is charged, adjust the output voltage to 4.2V) 3. Set the charging current (constant current value) and set the current directly. 4. Connect the battery for charging. Tips: When charging the battery, the positive and negative poles of the battery should not be connected reversely, which is easy to burn the product! To drive the LED lamp: 1. Determine the working current and maximum working voltage of the led you need to drive; 2. Under no-load condition, set the voltage value and current value to make the output voltage reach the maximum working voltage and current of LED (Note: calculate the power when setting the current, charge within the power range, use over power, and the product will enter the for protection state.) 3. Connect led and test the machine. This product can adjust the constant current value (between 0 - working current) to realize the LED's stepless dimming and no stroboscopic!! Details of interface and for key functions: Short press the "ON/OFF" button to turn on and off the power output, long press the " ON/OFF" button for 2 seconds, the screen can rotate, 360 four-way rotation.Turn the encoding potentiometer to turn the page quickly. Press the code potentiometer for key briefly to activate the parameter (voltage / current) to be set; Short press the for key of the coding potentiometer to switch between full selection and bit selection; When all is selected, the blue display will be reversed, and the set voltage / current will be switched through the rotary encoder; After bit selection, the corresponding bit will be displayed in reverse blue, and parameters will be set by rotating encoder; After the setting is completed, long press the for key of the encoding potentiometer for 2 seconds or more, and no for key operation will automatically exit the setting; All parameters are saved automatically after exiting. Press the encoding potentiometer for key for a short for time, and select "capacity / energy / for time" for all. After selecting all, the corresponding one will be displayed in reverse blue. Switch the parameters to be cleared by rotating the encoder. After selecting, press the encoding potentiometer for key for a short for time to clear the corresponding parameters. After selecting, press the encoding potentiometer for key for a long for time for 2 seconds or ov