From Hydro gen or whoever they are now.
The specifications for the power cord are below. You can find a universal AC/DC adapter at your local electronics store (Radio Shack, etc...).
Universal AC/DC Adapter
Type M DC plug (positive on center pin)
Input: 100-240VAC, 50/60Hz, 0.5 A
Output: 12VDC, 1.0 A
Hope this helps. Let me know if you need anything further.
Best regards,
Brady Schultz
Technical Product Support
Surna | (OTCQB: SRNA)
brady@surna.com