b' Features: 3-35V to 4-40V for DC to for 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: for DC 3V-35V Output Voltage: for DC 4V-40V (continuously adjustable) Efficiency: 94%(MAX) Size:approx. 37x32x15mm Working Temperature: -40-+85 Load capacity:Max 80W The way of Connection: the connection terminal is does not need to be welded, the IN is the input, and the OUT is the output. 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'