This is a smartphone adapter made by CELESTRON. It's an accessory that allows you to attach your smartphone to the eyepiece of a telescope, binoculars, or spotting scope to take photos and record observations. It uses a lever-style clamp for easy attachment and detachment, and the position can be adjusted with a fine-tuning knob. [Compatibility] ・Compatible with eyepieces with an outer diameter of approximately 35mm to 60mm (according to the manufacturer). ・Smartphone compatibility depends on the model and size. ※Please confirm compatibility with your equipment before purchasing. [Included Items] ・Main body ・Adapter ring ※Everything shown in the photos is included. ※Bluetooth remote control is not included. [Condition] ・Used ・There are minor scratches from use and storage, but 　there is no noticeable damage, and the fixing and adjustment functions work without problems. ※Please check the condition in the photos. [Notes] ・We cannot guarantee the results of photography or compatibility. ・Please purchase only if you understand that this is a used item.