Sanwa Supply Bluetooth Ring Mouse 400-MABT156BK Ring Mouse, Bluetooth Connection, 5 Buttons, USB Rechargeable, Finger Mouse, Black This ring mouse is worn on your finger like a ring, and you can operate the mouse pointer (mouse cursor) on your computer by tracing the sensor with your thumb. This is a Bluetooth-connected ring mouse that can wirelessly connect 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) Class 2 ■ 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: 1200 count/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 ※ When working on a computer for 8 hours a day and operating the mouse for 5% of the time (when fully charged). ※ Varies depending on the environment (temperature, etc.). Also, this is not a guaranteed value. I was looking forward to using it, but I haven't had a chance, so I'm putting it up for sale. It has only been used to confirm operation. I intended to use it myself, so there is no box. Please understand that this is a used item before purchasing.