Handheld Wired Trackball Mice Mouse / Thumb-Controlled Trackball, Connects Via USB Port

Works pretty well as a tabletop mouse and as a travel mouse. It is wired which is what I wanted for this application. But it has some drawbacks: 1.) It's pretty small. Not easily useable by an adult as a handheld mouse. You cannot hold it in your palm so you have to learn to hold it by the fingertips which makes it unwieldy. 2.) The roller ball has so much play in it that when you remove your thumb, the cursor moves before you can click. 3.) The size and configuration make it very difficult to pick up without right clicking wherever the cursor is located. 4.) The buttons are so sensitive it's easy click to by mistake. However, with practice, it's serviceable as a handheld just be sure to slow the the pointer speed down.

Update: I have owned this mouse for 3-4 months and it is completely broken. Left click button either clicks multiple times on not at all. Just sitting on the desk without being moved, it gives phantom instructions to my laptop. Pointer moves across screen on it own. Lasted 4 months for $25 not a success at all.