Digital DC-DC step-down power supply module with terminal connector port easy to connect with other devices Dual voltage and current LCD display, easier to recognize the output parameter Can be used as normal step-down power supply, battery charger and lgiht LED constant current drive module Input voltage: 5-23V, output voltage: 0-16, 5V, module size: 62 X 44 X 18mm / 2.44 X 1.73 X 0.71inch (L*W*H) Parameter: Voltage input voltage: 5v-23v, recommended within 20v Output voltage: 0.01-18V continuously adjustable, automatically saves the last set voltage value (input voltage must be higher of 1V at the output voltage). Output current: 3A max, recommended within 2A. (More than 2A, please improve heat dissipation.) Input reverse connection protection: Yes Short circuit protection: No Accuracy: 0.01 V, 0.01 A Display: Dual LCD display, 3 digits Conversion efficiency: up to 95% (varies voltage / current from input / output, voltage difference) Load regulation: S (I) 0.8% Voltage regulation: S (u) 0.8% Size: 62 x 44 x 18 mm Features: 1). This DC-DC buck converter is with calibration function, don't worry if the measurement is not accurate. 2). Equipped with a protective shell, this step down voltage converter is durable. 3). This DC voltage transformer adopts HD LCD display, can clearly display the voltage and current at the same time. 4). There are two voltage adjustment knobs on the power module, it is convenient for voltage adjustment. Voltage adjustment knob: Left knob - decrease; right button - increase. Short press - 0.01V fine adjustment; press and hold the key for 1s - quick setting. Note: The case needs to be assembled after receipt. If used for charging , after charging finished, please unplug the power first and then disconnect the input of the voltage regulator module, in case of current back flow and damage to the module. Package included: 1 x 9V voltage regulator