This is an ELECOM trackball mouse "Deft" with a 2.4GHz wireless connection. I bought it, but it didn't suit me, so it's been sitting unused. I don't think I used it for even 3 days. I have confirmed that it can be connected and operated via the dedicated receiver. Contents: - Trackball mouse body - Receiver unit ▼Product page https://www.elecom.co.jp/products/M-DT1DRBK.html - Brand: ELECOM - Model Name: DEFT - Connectivity: Wireless (2.4Ghz) - Number of buttons: 8 - Scroll wheel: Yes - Battery: 1 AA battery Connection type... Wireless