This is a quantity of 4 new MORNSUN  WRB2405S-2W  2W, fixed 24 VDC wide input, isolated and regulated 5 VDC output, DC-DC Converter.  Picture shows the package type, not the specific part.
The product features high efficiency up to 77%, SIP package, 1000VDC isolation, no heat sink is required with this unit, and an industry standard pinout.  Full product information is available in the data sheet at:

http://www.shjelectronic.com/FTP/WRB_S-1,2W%20Series.pdf

Multiple quantity orders will receive a shipping discount, and will pay actual shipping costs.  Please request an invoice on international and multiple quantity orders.