This item is a professional voltage set up module, which convert .5-3 to DC 4.0-3 , a nice and practical voltage regulator module for choice. Features - DC/ .5-3 to 4.0-3 Booster Converter Step Up Voltage Regulator LM2587. - Volume: length (3.8) * W (5.2) * (2.0) (CM). - Input voltage range: 3.5V-3 (output set voltage higher than the input voltage must be ) - Output voltage range: 4. -3 . - Input maximum current: 5A (based on power conservation under nominal conditions the output current * * efficiency = * ). - Continuous operating current: 3A (good ventilation conditions, the output voltage and input voltage ratio can not be greater than 3. - Note: If the output voltage is not higher than the input voltage, please adjust potentiometer clockwise, the output voltage will rise, please do not counterclockwise adjustment when the module in the case of high input voltage will be or even ! Package list: 1 * LM2587 DC/ .5-3 to 4.0-3 5A Booster Converter Step Up Voltage Regulator