This is a focus control system designed for use with the Ronin 4D, Inspire 3, and DJI High-Bright Remote Monitor. I opened it and tried attaching it once, but it's "almost unused" as it hasn't been used on location. I'm selling it because I haven't had the opportunity to use it due to changes in my equipment configuration. The interchangeable marking rings are still in their protective packaging, and there are no scratches or scuffs. I recommend this to those looking for a like-new condition. [Included Items] ・DJI 3ch Follow Focus Body ・High-Bright Remote Monitor Holder (Mounting Arm) ・Interchangeable Focus Marker Rings x 3 ・Original Box ※Everything in the photos is included. [Compatible Models] ・DJI Ronin 4D ・DJI Inspire 3 ・DJI High-Bright Remote Monitor [Shipping] The original box will be carefully packed with cushioning material and shipped.