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 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.

This is my first rollerball mouse and I was worried it would be hard to get used to but it's a very small learning curve. I was completely used to it after maybe 30 mins of use. It's very intuitive. The shape of the mouse is good as well. I have pretty small hands and it fits my hand nicely. I use the tilt feature as well. The ergonomics are spot on. The only con is the bearings for the ball are not replaceable. They feel a little sticky for small movements. I cleaned the holder and there was no change. I am going to try to oil the ball and hopefully that will help.

This is almost a straight copy of the MX Ergo except it is just a tiny bit smaller, lighter, and obviously cheaper. It's so close of a match that the Ergo Plus wedge works with it. DPI is a bit different and needs to be adjusted in Windows to get the same feel. Build/materials quality isn't the same. It's decent for the price, but the plastic is slippery and cheaper feeling. However, most importantly, the trackball movement is ultra smooth and precise and the included USB receiver has a good range. The biggest drawback is that the button click resistance is too low. This results in often unintended right clicks.I mostly love the Ergo except that the crown is just a touch too high for my hand and makes the area between my thumb and forefinger sore after extended use. I have tried all sorts of angles and wedges and positions but finally decided to try other thumb trackballs. This is the 4th alternative I've tried and first one that feels more comfortable for my hand size and ergonomics. Hopefully it's durable and a long term keeper. Worried that the extra right clicks will get too annoying to deal with.ETA: I put 3 narrow layers of duct tape under the right mouse button to give it a bit more resistance. Makes the click feel a bit odd, but stops most of the unintended presses. Maybe I'll stumble onto something better in time, but for now this seems like a decent 'fix'.

In the past I used Logitech and they were fine but pricey. I tried another brand under $30 on Amazon (I believe Nubea) which was fine but wore out after several years. I saw some good reviews for this online and figured it would be my replacement. It took a bit getting used to as the feel and configuration are slightly new to me. But I am very impressed. I switch between my phone (Samsung Dex) and laptop frequently enough that I really enjoy having the button to change devices on the top (other mouse had this switch on the bottom). It's easy to charge with USB type C. Has a quality feeling hard shell. Angling it for my hand is nice and that hasn't collapsed while in use. The scroll and buttons are solid. The buttons are nearly silent and were triggered too easily at first but I've gotten use to the feel and they are great. I would say the only downside is no built in storage for the dongle but I leave that in my laptop anyway.

I originally bought this because I have a Logitech MX Ergo that I love and wanted a similar style mouse for another computer. There isn't a lot of options for thumb-ball mice so when I saw this alternative I decided to give it a try (it helps that it is substantially cheaper than the Ergo).My initial impressions were positive. It has pretty much the same look as the Ergo, the biggest difference was that the buttons on this mouse click a lot softer (which could be a pro or a con based on preference).After using it for awhile though I've noticed pain in my thumb muscle - and I realized that it is due to the poor accuracy of the mouse. I often find that when moving the ball around even a little it will jump too far, causing me to move the ball back and forth until it lands where I want it to (it isn't a settings issue, I'll explain more below).The mouse ONLY has this issue when I am applying downward pressure on the ball with my thumb (just letting the mouse support the weight of my hand). I think it's because the balls inside are plastic and probably distort enough from that pressure that the motion 'sticks' in a way that it doesn't when that pressure isn't applied.I'll be getting another MX Ergo to replace it but it isn't a bad option to have as a backup for short stints.

I LOVE this device. Compared to my logi in the same functionality, it is a bit smaller in terms of the hand space on the device, but I like itI like the "tilt" functionality as well that is not in the logi device.All in all, for the price and not to forget that now I can use a single mouse for my three devices, it is utterly priceless

Very nice mouse. Fits in the hand well and swivel effect of the base is very nice. Buttons, thumb ball and wheel work well.I would recommend this to all.

perfecto