Surface mounting.
Vent-Axia W300310 Single Direction Variable Speed Fan Controller
Vent Axia Electronic 1.5A Single Direction Variable Speed Controller W300310
Vent-Axia Electronic Variable Speed Controller 1.5A Single Direction W300310.
Ventaxia W10303102M, 405169A, Industrial 2.5A variable speed controller
12V 24V USB Car Cooling Fan with Dual or Single Head, Two Adjustable Speeds, Dual USB Charging Ports and 360 Degree Rotation (12V Single Head)
Dual USB 12V 24V Car Fan with Single or Dual Adjustable Head, Two Speed Control and 360 Degree Rotatable Airflow (12V Single Head)