Thank you for viewing! Kensington SlimBlade Trackball (Slimblade) This is a special edition unit with silent customization. The switches have been replaced with silent switches, and the clicking sound that occurs during scrolling has also been eliminated. The unit has been disassembled and the following silent modifications have been made: ① Silent click buttons The switches have been replaced with silent type switches, making the click sound very quiet. The switches used are here: https://www.amazon.co.jp/dp/B0828LH5RN ② Silent scrolling The speaker (buzzer), which is the cause of the "click-click" scrolling sound unique to the SlimBlade, has been removed. Therefore, scrolling operations are silent. *Due to customization, the specifications differ from the original state. Please be aware of this if you are concerned. [Product Information] Brand: Kensington Model Name: SlimBlade Trackball Model Number: M01400 Operation confirmed (cursor operation, click, scroll, no problems) [Condition] No noticeable scratches on the top plate or ball. The sole on the back is also clean. Overall, it is equivalent to "no noticeable scratches or stains". It is in very clean condition for a used item. [Accessories] Main unit only (integrated cable) Since silent customization is a matter of preference, please purchase only if you understand this point. It will be carefully packed and shipped. Immediate purchase is welcome! Connection type...Wired