Sanwa Supply Bluetooth Ring Mouse 400-MABT156BK Ring Mouse, Bluetooth Connection, 5 Buttons, USB Rechargeable, Finger Mouse, Black This mouse is worn on the finger like a ring, and the mouse pointer (mouse cursor) on the computer can be operated by tracing the sensor part with the thumb. This is a Bluetooth-connected ring mouse that can be wirelessly connected to Bluetooth-enabled computers and tablets. It is a USB rechargeable type that does not require batteries. Specifications ■ Body size: Approx. W32.9 x D60.4 x H35.6mm ■ Weight: Approx. 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 material) / radius approx. 10m, Steel desk (magnetic material) / 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 * When working on a computer for 8 hours a day and operating the mouse for 5% (when fully charged). * Varies depending on the environment (temperature, etc.). Also, it 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.