Ergonomic Wireless Trackball Mouse, 3 Device Connection (Bluetooth or 2.4G USB Receiver) Bluetooth Quiet Computer Mouse, 2*AAA Battery Thumb Laptop...

[Ergonomic Design] - Relaxed Hand and Arm, Precision-engineered, it reduces hand fatigue with thumb controls instead of wrist/arm movements.Let the easy and smooth thumb control help you reduce your muscle stress. The optimal angle of the trackball mouse allows you to keep your palm in a natural position for all-day comfort. [3 Devices Connection - BT1+BT2+2.4G] - 33 feet / 10 meter wireless connection range.This wireless mouse connects via Bluetooth or the included 2.4G USB receiver, Supported by an Easy-Switch button.No need to re-pair for a seamless workflow. Compatible with PC, Mac, laptops, tablets and so on. [2*AAA Triple A Battery Required] - Two AAA batteries are required and are not included.There is no built-in battery, allowing for longer product lifespan and eliminating concerns about built-in battery failure. New batteries can be replaced at any time.Utilizing AI-based design concepts, resulting in less damage and longer battery life.No charging required, conve