This is a set of two lens heaters. It's a great deal, although it only includes the items in the photos, without the box. The first one has been used a few times, and the second one is new. It has 3-level temperature adjustment. Operation has been confirmed. Body size: (approx.) Length 45 x Width 4.5 x Thickness 1 cm USB cable length: (approx.) 150cm Compatible with astronomical telescopes and single-lens reflex digital cameras with a lens outer diameter of 140mm or less. Compatible with cameras such as Canon/Sony/Nikon/SIGMA/SAMYANG/TAMRON. (Please measure the lens outer diameter before purchasing.) Thank you.