The appearance is particularly clean. It has been used for about six months. Bearing [The scroll wheel is not smooth.] It can be used without any problems if you don't use the scroll wheel! Or, you can repair it yourself and make it usable! The repair itself involves removing the screws and replacing the internal balls. Expert Mouse (64325) Brand: - Mouse/Trackball Type: Trackball Cable Type: Wired Connection Method: USB Number of Buttons: 4.0 buttons Color: Black / Gray Weight (g): 390.0 g To prevent any trouble, returns are not accepted after shipping. Thank you.