This Small and lightweight UBEC features a High efficiency switch mode design providing better heat dissipation when compared to linear voltage regulators. The shielded PCB design and output EMF coil makes helps provide a stable and low noise voltage output.  
Specs:
Input: 6V-25.2V (2-6S Li-Po, 2-7S Li-Fe or 5-17S NiXX Battery Pack)  
Output: 5.5V/5A
Dimension: 43mm x 21.4mm x 13.2mm(LxWxH)
Weight: 23g (wires included)