step-down DC-DC digital 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 18 mm / 2.44 X 1.73 X 0.71 inch (L * W*H) Parameter: Input voltage: 5v-23v, recommended within 20v Output voltage: 0.01-18V continuously adjustable, automatically saves the last set voltage value (input voltage should be 1V higher than output voltage). Output current: 3A max, recommended within 2A. (More than 2A, please improve the heat dissipation.) Input reverse connection protection: Yes Short circuit protection: No Accuracy: 0.01V, 0.01A Display: dual LCD display, 3 digits Conversion efficiency: up to 95% (input/output voltage/current varies, voltage difference) Load regulation: S (I) 0.8% Voltage regulation: S (u) 0.8% Size: 62 x 44 x 18mm Features: 1). This DC-DC buck converter has 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 button - decrease; right button - increase. Short press - 0.01V fine adjustment; press and hold for 1s - quick setting. Note: The case needs to be assembled after receipt. If it is used for charging, after charging is completed, please disconnect the power supply first and then disconnect the input of the voltage regulator module, in case of current backflow and damage to the module. Package included: 1 x 9V voltage regulator If you have any questions, concerns, or need further information, please feel free to contact us anytime. Our team is dedicated to providing you with support and answering any inquiries you may have. Your satisfaction is our ultimate goal. We look forward to offering you top-quality products and service! Thank you for your support.