Adesso T50 Wireless Ergonomic Finger Trackball Mouse, 50.8mm Index Finger Trackball, Programmable 7 Button Design, 5 Adjustable DPI Switch, for Left and Right Hand, Compatible with PC, Laptop - Black

The only problem with this is where they placed the scroll wheel which seemed odd to me looking at it and it is a little odd being down there but not enough to really make that big of a difference for me. What's good is that it does work on the Mac if you use the "Steer Mouse" program, you can program all the buttons on the device using that program and even set it up for different applications (I didn't mess around a lot with it but I was able to program all the buttons to my preference and I was able to reverse the direction of the scroll wheel). The trackball on it is the smoothest that I've used. So overall it's a very good product.

I ordered three of these then soon discovered they are unreliable. The ball stops responding after a short period of time. I have to press a button before the cursor will respond as I move the ball. Changing batteries, repositioning, changing usb ports, etc. did nothing to fix the problem. I messaged the vendor and was told return shipping was not included. The shipping cost exceeds the cost of the unit so these are essentially without warranty. No warranty deserves no stars. I ended up with one properly working trackball out of three that I ordered. Definitely NOT recommended!

Dificil manipular o cursor em virtude do tamanho e formato retangular do mouse, a mão fica aberta sobre o mousse, dificultando a manipulação precisa do cursor que só ameniza um pouco quando configura as teclas rapidas. Depois de seis meses já não funciona

Ich benutze schon mehrere Jahre Trackballs, aber keine hat bisher meine Anforderungen so erfüllt wie die von Adesso. Sie ist zwar groß, aber die Kugel lässt sich präzise steuern und die DPI ist super leicht einstellen. Also ich kann sie nur empfehlen, ist jeden Euro wert.

merci !!!