DescriptionYou just need to set up output voltage, then no matter the waving of input voltage, it would automatically step up or down to keep output voltage stable. Designed for solar panel using, also fit for other applications.Features- Size: 52 * 38 * 15mm(with fixed column).- Input: 3.5-28V.- Output: 1.25V-26V.- Maximum input current 3A.- Maximum output 3A.- Rated input 1A, Output 1A.- Designed for solar panel using, also fit for other applications.