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

This product hit all the numbers for me! I've been through countless different roller ball style devices. The manual says you can connect up to three separate computers, I only needed two so the third was a bonus. It connected easily and was plug & play for the most part. With the click of a button I can change between computers/monitors easily. The ergonomic adjustments on this make it very comfortable to use. Its the perfect size and the scrolling device / ball have just the right amount of resistance for easy use. I was skeptical when I purchased this device but its been a homerun for my usage. I charge it every few months... seems to do great with pretty heavy usage.

I found the ProtoArc Wireless Trackball Mouse to be my new favorite computer mouse! As soon as I unboxed it, every step after felt like a premium product. The packaging was super protected, clean, and stylish in its own sort of way. It is the easiest mouse to connect and use after the small learning curve of a trackball mouse. It is also so comfy, the perfect size, easy on the hand, and I have had no strain whatsoever when using it over long periods of time. Overall, I give this computer mouse a 5/5 stars!

The fine motor function of this mouse is choppy and skips as it moves. I have to reduce my mouse speed to 2 for it to be placed accurately over small objects without overshooting. This does not work as I use my mouse on three devices and need to move at a quicker pace. The mouse is new and not dirty. If slow speeds are acceptable to you, then it's an excellent mouse in that regard. Additionally, the description above says it has a DPI change function. This is only available on the EM01, not on this EM01 NL.

This mouse is awesome! I usually go for the Logitech mouse at home and work, however it drives nutts when the batteries die and you're out. So after spending a couple of hours watching YouTube videos, I decided this try one of these. It rocks! Waiting for my 2nd one to arrive for home use in an hour or so.

The ergonomics are very good. The shape and size fit my hand perfectly, but there was a fatal flaw. Fully charged battery lasted less than three days under light use. Our other track balls, keyboards and track pads, which are mostly rechargeable, all work for several weeks without needing a recharge. Two of our devices use plain old AA batteries, and these are the least troublesome. ProtoArc obviously put sone thought into the product, but forgot that, while Lithium Ion batteries have come a long way, there's nothing as cheap, reliable and easy to procure, as the AA Alkaline battery. And, they're safe, never catch fire, and don't require warning labels when shipped.In short: stick a AA cell in this thing, drop the price, and you'll have a winner.Sadly, I have to return this thing. Life's too short to waste time on temperamental mice.

Great alternative to the Logitech MX Ergo. I have the Ergo and love it. I bought this to have a USB-C version of the Ergo for another device. Lighter, softer clicks, but overall it is great. Much better price as well.

This barely took any learning curve to use. From the first day that I bought it to the time of this review being posted, I haven't had to charge it. Being able to adjust the sensitivity of the trackball has helped immensely. This all being said, the battery life and the accuracy of the pointer have been so smooth! The best part of it all, I don't need to drag a mouse all over the desk to find the cursor, nor do I need a mousepad. The mouse doesn't have a small footprint, however if you consider that you are taking away the mousepad and the mouse it does take up less space than a traditional one.

I have 3 of these mice for various setups, the feel identical to my Logi ergo trackball, the only difference is the mouse 1 and 2 buttons are a little soft and dont provide a satisfying click.