DC-DC Voltage converter module Buck Boost 
Lovely quality modules, supplied in anti-static packaging.
 
Features:
    Conversion efficiency: Up to 92% (the higher the output voltage, the higher the efficiency)
    Potentiometer adjustment direction: Clockwise (increase), Anti-clockwise (decrease)
    Switching frequency: 150KHz
    Rectifier: Non-synchronous rectification
    Module properties: Non-isolated step-down module
    Short circuit protection: Current limiting, self-recovery
    Operating temperature: Industrial grade (-40 to +85 degrees Celsius) (output power 10W or less)
    Load regulation: +/- 0.5%
    Voltage regulation: +/- 2.5%
    Dynamic response speed: 5% 200uS
    Connection mode: Solder, plus pin can be directly soldered PCB

Specifications:
    Input voltage: 3-40V
    Output voltage: 1.5-35V (adjustable)
    Output current: Rated current is 2A, maximum 3A (if the output power more than 10W, the heat sink is needed.)
    Item size: 48 * 22 * 12mm / 1.9 * 0.9 * 0.5in
    Item weight: 12g / 0.4oz