SainSmart DC DC Step-down power supply Converter with case 3.5-30V to 0.8-29V 10A MAX SainSmart is well known and provides high quality electronics product SIZE : 85mm*32MM*60MM Input voltage : 3.5-30V Output voltage: 0.8-29V (adjustable) output must be lower 2V than input Conversion efficiency: 92% (test on 24V to 12V 2A)