The Anker Wireless Vertical Ergonomic Mouse is a full-sized device and my male hands rest easily on it. I think most adults would be able to use the mouse but those with small hands or short fingers might struggle with the scroll wheel. (They might want to consider Lift from Logitech.)
Under the fingers, the mouse has left and right buttons plus a scroll wheel acting as a centre button. By the thumb are buttons for page up and page down. The buttons click satisfactorily and the scroll wheel is easy to turn. That’s all fairly standard but the Anker mouse has one trick up its sleeve. There’s an extra button on the top edge which toggles the mouse’s “dots per inch” between 800, 1200 and 1600 dpi. Simply this means that the amount of screen movement for a given mouse movement can be adjusted on the fly. It’s handy for games and such.
I found the mouse comfortable to use but it takes a little bit of time to get used to the vertical orientation. Once that’s done, it’s plain sailing and I personally found it less tiring than using a standard mouse. Ultimately, I found the Logitech Trackman Marble trackball more suited to my needs for daily use, though sadly it seems to have been discontinued now.
The Anker Vertical Mouse is available in two versions; one wired, one wireless. Obviously, this is the wireless version. Priced at US$30 / UK£24, it’s available direct from Anker and other good retailers. The wired version comes in at £17. Unless there’s a really good reason for the wire, I’d splash the cash and get the wireless one.
Vertical ergonomic mice are available from other suppliers such as Logitech but they’re three times the price so I’d be tempted to try out the Anker and see if it works for you first. I’ve noticed that what appears to be the same mouse is available from other suppliers such as Trust and Perixx so do shop around.
For the purposes of disclosure, this was a personal purchase.