Sanwa Supply Bluetooth Ring Mouse 3 400-MABT156BK2 It's good for using while doing other things, and you can even use it while lying down, since it's small. Ring Mouse Bluetooth Connection 5 Buttons USB Rechargeable Finger Mouse Black You can wear it on your finger like a ring and operate the mouse pointer (mouse cursor) on your computer by tracing the sensor part with your thumb. This is a Bluetooth-connected ring mouse that wirelessly connects to Bluetooth-enabled computers and tablets. It's USB rechargeable, so no batteries are needed. Specifications ■ Body size: Approximately W32.9 x D60.4 x H35.6mm ■ Weight: Approximately 16g (mouse only) ■ Connection method: Bluetooth ■ Compatible standards: Bluetooth Ver.5.0 (BLE) Class2 ■ Profile: HOGP (HID over GATT Profile) ■ Frequency range: 2.402GHz to 2.480GHz ■ Communication range: Wooden desk (non-magnetic)/radius approx. 10m, Steel desk (magnetic)/radius approx. 2m ※ The communication range of radio waves varies depending on the usage environment. ■ Resolution: 1200count/inch ■ Reading method: Optical sensor method (IR LED) ■ Buttons: 5 buttons, cursor sensor ■ Battery performance: Continuous operating time/approx. 26 hours, Continuous standby time/approx. 2433 hours, Usable days/approx. 52 days ※ Based on 8 hours of computer work per day, with 5% mouse operation (when fully charged). ※ Varies depending on the environment (temperature, etc.). Also, this is not a guaranteed value. I have used it for about a month. Since it is a used item, please purchase it with your understanding.