Features: Brand new and high quality IN + input positive-IN-input negative.The OUT + output the positive OUT-output negative Input and output cannot be reversed. The reverse connection may burn. Input voltage range: 3V to 40V (input voltage must be high than the output voltage above 1.5V. Could not boost) Output voltage range: Voltage from 1.5V to 35V continuously adjustable, high efficiency of output current of 3A. 36u thick circuit board, power inductor with output LED indicator lamp are all used. Specifications: Material:ABS Input: 3V-40V Output: 1.5V-35V Length:Approx.4.2x2cm/1.65x0.79inch Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Power Converter