I purchased this from Amazon and used it for about 3 days, but a trackball just isn't for me, so I'm selling it. I think it's practically unused. The original box and all accessories are included. Ergonomic wireless trackball design. - Model: ERGO M575SPd - Brand: Logicool - Type: Trackball - Features: Wireless Connects via Bluetooth or wireless (USB receiver included). - Switch: On/Off switch - Package: Original box included - Power... Battery operated, 1 x AA battery (test battery included) This is a model that silences and updates the connection method of the popular M575 trackball mouse. Compared to the M575, the click sound is reduced by 80%. The connection method has been updated from Bluetooth & Unifying to Bluetooth & LogiBolt. Reference URL https://www.logicool.co.jp/ja-jp/shop/p/m575sp-ergo-wireless-trackball https://www.amazon.co.jp/stores/page/4D3AA672-5389-478A-BFF9-FE1BE7621F21?channel=unuse_phr&gad_source=1&gad_campaignid=22957573418&gbraid=0AAAAA-cFyrj8GbTDmD7g5qxbE3EP3Bby7&gclid=CjwKCAiA09jKBhB9EiwAgB8l-JIeHiZnbA6PibMhYLLj5RloLFNQLe-TvTm-dtBX1iLkJC4vJ-79LRoCBHUQAvD_BwE