I haven't used it much, so I think there are no noticeable stains or dirt. The box and instruction manual are not included. * Trackball "DEFT PRO" (index finger operation type) * Uses long-life components, achieving a 3-year manufacturer's warranty * A further evolved high-spec model High-spec wireless trackball "DEFT PRO" This is a high-spec wireless trackball "DEFT PRO" that uses long-life components and has a 3-year warranty. ● Interface: USB \* For wired/wireless 2.4GHz connection mode ● Connector shape: USB (A) male \* For wired/wireless 2.4GHz connection mode ● Compatible models: Windows PCs and Macintosh computers equipped with a USB interface ● Supported OS: Windows 10, Windows RT8.1, Windows 8.1, Windows 7, macOS High Sierra (10.13) \* Updates to the latest versions of each OS and installation of service packs may be required. \* The horizontal scroll function cannot be used in Windows RT8.1. ● Resolution: 500/1000/1500 counts (switchable) ● Communication method: GFSK method (when connected via 2.4GHz) / FHSS method (when connected via Bluetooth) ● Radio frequency: 2.4GHz band \* For wireless 2.4GHz/Bluetooth connection mode ● Radio wave reach: When used on a magnetic material (such as an iron desk): 3m, when used on a non-magnetic material (such as a wooden desk): 10m ● Reading method: Optical sensor method ● Emission light type: Invisible wavelength range ● Number of buttons: 8 \* Including the wheel button ● Number of wheels: 1 ● Horizontal scroll function: ○ ● Receiver storage: ○ ● Continuous operation time: \[When in 2.4GHz connection mode] Low energy mode: Approximately 134 hours, High-speed mode: Approximately 91 hours / \[When in Bluetooth connection mode] Low energy mode: Approximately 167 hours, High-speed mode: Approximately 104 hours ● Continuous standby time: \[When in 2.4GHz connection mode] Low energy mode: Approximately 925 days, High-speed mode: Approximately 925 days / \[When in Bluetooth connection mode] Low energy mode: Approximately 925 days, High-speed mode: Approximately 925 days