This is the Mini-360 DC-DC step down buck converter power supply.  This power converter can convert a voltage between 4.75VDC to 23VDC all the way down to between 1.0VDC to 17VDC.  It includes an adjustable pot to set the desired output voltage.  This converter can reach a maximum conversion efficiency of 95%.  It can maintain a continuous current output of 1.8A and a momentary surge current of 3A.  This module is in an extremely small 18x12mm package so it is perfect for applications where space is at a premium!