SMAKN&reg; Adjustable DC to DC Converter Power Adapter 6-24V to 1-20V 4A Constant Current LED Driver Battery Charging Module Power Supply Regulator Rectification: Non-Synchronous Rectification. Input voltage: DC6-24V. Output voltage: DC1-20V. Output Current: 0.1 ~3A adjustable,Max 4A. Conversion efficiency: 98% (maximum).