DC-DC high efficiency variable power supply kit with voltage display - 2A Out

This listing is for a really neat variable DC-DC with voltage display.  The video above gives you a full demonstration of how it works.  Using an on board button, you can choose to display the voltage at the input or at the output.  Using a 10-turn variable resistor, you can fine-tune the voltage at the output.  There are four mounting holes; one on each corner.  This is a small, but powerful DC-DC power supply.  It feels very sturdy in hand, and it can easily be mounted to your project.  Below are some specifications and features.  Make sure to watch the above video!!!
The inputs are labelled, and are talked about in the video.  

Pinout:
IN+ = Input Voltage
IN- = Input Ground
OUT+ = Output Voltage
OUT- = Output Ground

Features:
1) On board voltage display that is capable of displaying 0-40v.
2) Power saving connection.  When the P3 header is removed, the power supply will still act normally, but the voltage display will turn off to save power.
3) On board button allows for you to display with input and output voltage. 
4) Reverse polarity protection.

Specifications:
Input Voltage: 4v - 40v Max (DC Only)
Output Voltage: 1.25v - 37v  
Source Current = 3A Max Surge - Up to 2A Nominal
Size: 65mm(L) x 35mm(W) x 13mm(H)
                                                                                                  If you have any questions, please do not hesitate to ask!