Features:Brand new and high quality2.4V-6V to 3.3V-9V DC to DC Adjustable Boost Power Supply Board Module.Adjust the blue knob of the potentiometer and with a multimeter to monitor the output voltage reaches the required voltage.Built-in over temperature for protection, full set overcurrent for protection circuit reliability, high reliability.Conventional Constant Voltage Output BOOST Fully Integrated Solutions, Integrated MOSFET, Fewer External Components, Smaller Cos System.Input and Output must be connected correctly. Specifications:Input Voltage: DC 2.4V-6VOutput Voltage: DC 3.3V-9VLenth: approx. 33mm/1.30inEfficiency: 90%(MAX) Note:When the output voltage is closer to the output voltage,the carrying capacity is higher,and the efficiency is also higher. Package includes:1PC x DC-DC Adjustable Step-up Boost Power Supply Module