ProtoArc Wireless Trackball Mouse, EM01 NL Ergonomic Bluetooth Rollerball Thumb Mouse Rechargeable Computer Laptop Mouse, Adjustable Angle & 3 Device Connection for PC, Mac, Windows-Gray Ball

Initial 2 days working well after that scrolling is very bad and scrolling speed is very bad, it unstable.

Inherently defective scrolling input and scroll wheel and this directly leads to unusability, after few days the scroll become jittery than starts registering opposite scroll inputs to what you give than altogether becomes frustatingly unusable. I returned even though i got a better deal of 3650 instead of usual price of 4100

avec clavier virtuel car arthrite +++++ aux mains

Muy cómodo. Excelente relación costo / beneficio. El track Ball es súper suave, incluso más que el Ergo MX. Los botones requieren de poca presión para activarse. Funciona muy bien.

Rato de muito boa qualidade. Ao fim de 6 meses de utilização nunca mais tive dores no pulso. Cheguei a pensar que, por ser trackball que provocasse desconforto ou dores no polegar, mas nada disso. Tem uma ergonomia perfeita, botões silenciosos assim como uma adaptação extremamente rápida. Ao fim de 2 dias já usava o rato de uma maneira perfeitamente normal e natural. Recomendo vivamente para quem costuma ter dores no pulso ao usar o rato durante muitas horas por dia. Só não recomendo para gamers e edição gráfica, mas para trabalho de escritório é o ideal.

Nice stylish black trackball with (I choose) a red ball. Luckily no fancy LED lights, and connects to PC and MAC. Great!! What could be improved is a small storage area in the trackball for the dongle (wifi/bluetooth)

I was looking for a good vertical mouse to ease the strain on my shoulder. This mouse fit the bill perfectly and I love the fact that you dont have to move it around, it just stays perfectly in place next to my keyboard and I never have to worry about running out of space to move the cursor. I have a standard (non-trackball) vertical mouse at work that is worth over twice as much as this one, but I like this trackball mouse a lot more. One of the best home office purchases I have made. Thanks.