INDEX FINGER TRACKBALL Equipped with a 44mm trackball, move your cursor with one finger movement instead of moving your wrist and arm. It will effectively reduce fatigue and strain for your wrist and arm. Ergonomic Design The design of the ultra long hand rest allows this mouse to fully fit your palm, it can reduce arm strain and keep your hands in the most comfortable position at all times Whisper-quiet Click 5 levels (100/200/400/800/1600 ) Rehcargeable Mouse Equipped with build-in rechargeable battery, no need to replace the battery you can recharge the mouse easily with the Type-c cable included in package One mouse for three devices This trackball mouse has triple connection modes. You can control three devices at the same time, Trackballs in different positions After long-term use, please remove the trackball and wipe with a soft cloth to the trackball roll smoothly; The backward and forward button is not fully compatible with OS; Press and hold the scroll wheel and the right button simultaneously for 5 seconds to change ; The mouse can be connected with 2.4G (USB dongle) + Bluetooth1/Bluetooth2 (without the dongle); Acceleration: 40 G Movement speed IPS: 450 Sensor model: Instant A704F (7200 |60 IPS|20G) Operation Mode: Trackball Power Type: Rechargeable Number of Buttons: 4 Number of Rollers: 2 Hand Orientation: Right Package: Yes Style: Trackballs Backlight : 1600 Interface Type: USB Type: Bluetooth Wireless Material: plastic colour: Black Package Contents: 1 x Rollerball Gaming Mouse Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.