Orion 7816 Cooling Accelerator Fan for Large Reflector Telescopes
Speed up the cooling of your big reflector telescope's optics with this small, quiet fan. Cooling your telescope optics significantly improves the quality of views through your reflector. You don't have to wait for lengthy telescope cooldown with this handy and effective cooling fan. Uses eight D-cell batteries (not included). Battery life is about 13-14 hours of continuous operation