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ProtoArc Ergonomic Vertical Trackball Mouse - Triple Mode Connection (Bluetooth/2.4G), designed for painless operation Product description: Is wrist pain bothering you? Try ProtoArc trackball mouse! 44Mm Trackball: Provides smooth and accurate control for designers and editors. Three-mode connection: 3 devices can be paired simultaneously through Bluetooth 1, Bluetooth 2, and 2.4G receivers. Vertical ergonomic design: reduce the burden on the wrist, especially suitable for long-term use. Novice-friendly: No need to move your arm, just move your fingers! This mouse is ideal for office, graphic design, and all those who seek comfort. Switch devices easily and protect your wrists and muscles!