Elecom Trackball Mouse M-HT1URXBK I used it for about a week, but it didn't suit me, so I'm putting it up for sale. All accessories, such as the instruction manual, are included. ■ Interface: USB ■ Connector shape: USB (A) male ■ Compatible models: Windows PC and Macintosh equipped with a USB interface ■ Resolution: 500/1000/1500 counts (switchable) ■ Reading method: Optical sensor method ■ Emission light type: Invisible wavelength range ■ Number of buttons: 8 * Including wheel button ■ Number of wheels: 1 ■ Horizontal scroll function: ○ ■ Power supply: USB bus power ■ Rated voltage: 5V ■ Color: Black ■ External dimensions: Width 114.7mm x Depth 181.9mm x Height 57.2mm ■ Size classification: LL size ■ Cable length: Approximately 1.5m ■ Weight: Approximately 268g * Including cable ■ Accessories: User's manual x 1 ■ VCCI class B compliant: ◯ Connection type... Wired