Fangrui Product Details Input:12-75v Output:2.5-50v Adjustable Current:25a (max) Efficiency: Maximum (the Smaller The Pressure Difference, The Higher The Efficiency) Wiring:high Power Situation, Wiring As Thick As Possible. Name:dc-dc Adjustable Buck Module Voltage Conversion At A Glance: 12-75v To 5v 12-75v To 9v 14-75v To 12v 17-75v To 14.8v 19-75v To 16.8v 22-75v To 1 9v 24-75v To 21v 28-75v To 24v 35-75v To 30v 41-75v To 36v 48-75v To 42v 55-75v To 48v In+:input Positive Vadj: Output Voltage Regulation 0ut+: Positive Output In-: Input Negative Clockwise Large Counterclockwise Small Out-: Output Negative Note:charge Batteries, Batteries, Output Please Add Your Own Diode To Prevent Reverse Irrigation! Different Factory Batches May Have Slight Differences In Appearance, Which Will Not Affect The Use. Colour:as Shown Material:plastic+metal Package Contents: 1 * Dc Step Down Module Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item