Thank you for viewing. This is a wireless mouse with ball tracking. It has been disinfected and its operation has been confirmed, but the left click may experience chattering, so it is being sold as a junk item. Therefore, returns are not accepted. If you are concerned, please address it with a chattering repair spray. - Model Name: EX-G M-XT2DR - Brand: ELECOM - Tracking Method: Ball type - Connection Type: Wireless