Updated Review (08/2023)Having used the Tecknet mouse for almost a year, I'm docking two stars from my previous, five-star review. Recently, the accuracy of the mouse has dropped off in a fairly material way. I frequently have to click several times on application icons to open the application. Also frequently, the mouse cursor simply disappears from the screen (particularly when traversing application windows) and I have jiggle the mouse to have it reappear. And finally, the Bluetooth connection requires that the mouse be moved and clicked in order to wake it up whenever I initially turn on the computer or return to the computer in screensaver mode. I thought that was simply the way Bluetooth mouses work (versus 2.4G wireless which simply requires the mouse to be moved to wake up the computer).With the degraded performance of the Tecknet mouse, I recently decided to purchase UGREEN 2.4G/Bluetooth mouse which has all the same features as the Tecknet mouse (but with 4 dpi modes versus the Tecknet mouse's 3). The performance of the UGREEN mouse helped underscore the flaws in the Tecknet mouse. In particular, even though I connect the UGREEN mouse to the computer via Bluetooth as I do with the Tecknet mouse, I can wake up the computer by just jiggling the mouse (like you do with a 2.4G connected mouse). The UGREEN mouse never requires multiple clicks on an icon/button to launch applications and the mouse cursor never disappears from the screen. I will say that the UGREEN mouse was more clumsy to initially connect to the computer than the Tecknet mouse but that's a one-time connection and, once connected, it's solid. The Tecknet mouse is decent enough but, in my experience, the performance degrades quite significantly over time.Original Review (09/2022)I recently purchased this Tecknet dual-mode mouse to replace an aging Logitech M510 that had been dropped on its head a number of times during its lifetime. Both the M510's scroll wheel and tracking had become quite spotty and a replacement was necessary. I've always purchased Logi devices with the Unifying USB receiver which allows the easy addition of other Logi Unifying devices, however, since I really only use a mouse with my laptop, I thought I'd save a bit of money and try a non-Logi mouse with Bluetooth this time around (if I decide to get an external keyboard, I'll just make that one Bluetooth as well which nullifies the benefits of Logi's Unifying receivers). This Tecknet mouse additionally provides 2.4GHz connectivity via the USB receiver which is a nice bonus should you have issues with Bluetooth or can't use Bluetooth (I found Bluetooth to be problematic when switching a Macbook Pro from macOS to Windows via Bootcamp - would work on one OS but not the other requiring constant re-pairing; 2.4GHz wireless, however, had no problem).First I was very pleased to see the small, cardboard, "frustration-free" box this mouse arrived in (I coincidentally also bought a new Logitech M650 for my wife and that mouse came in the usual, environmentally-unfriendly, large, plastic packaging).Of course, I didn't fully read the instructions (I'm a software developer so I obviously think I know everything) but, notwithstanding that, this mouse was a breeze to set up on Bluetooth. My PC recognized it instantly (you'll see two available BT devices: "BM20X-3.0" and "BM20X-5.0," one for BT3 and the other for BT5; I chose BT5). There doesn't appear to be any separate configuration software; instead, the mouse complies with the common settings for each of its buttons (left-click, right-click, center scroll, center press to allow gesture direction scroll, and back/forward on the two side-mounted buttons). Cursor speed, acceleration, and scrolling is pretty much perfect for me right out of the box with the default Windows OS settings for the mouse. The DPI setting button (right above the scroll wheel) is pretty interesting and a feature I haven't seen before even on quite expensive mouses (mice?). There is no obvious indicator as to which DPI setting you're on but, if you click the button and move the mouse then click the button again and move the mouse and then do it a third time, you should be able to see the difference in tracking. For me, what I'm guessing was the lowest setting (1,000 dpi) was a bit too slow while the highest setting (2,000 dpi) was a bit too fast. The middle setting (1,500 dpi) was Goldilocks - just right. This is very neat to see as a hardware setting (you'd normally be fiddling with the mouse configuration software to perfect the tracking and acceleration of your mouse).In terms of comfort, I have what I'd say are medium-sized men's hands and this mouse is perfectly comfortable. Compared to my old M510, it's about the same width but a bit shorter. The M510 is a big mouse at 4.5" long by 2.5" wide. The Tecknet mouse is about 4 1/8" long by 2.5" wide. I find both to be comfortable. The Tecknet mouse is not a compact mini-mouse as some reviewers have indicated (the Logi M325 is an example of a compact mouse that is 3.75" x 2.25"); it's a regular sized mouse that should be perfectly comfortable for most normal sized men and women (if you've got Sasquatch-sized hands, you might want to look at the 4.5" Logi M550L or M650L where the "L" means "large"). The clicks are what you normally expect from a mouse (neither quiet nor overly loud) and the scroll has the usual clicky scroll sound. I prefer this standard behavior. (As a side note, the Logi M650 supposedly has a "smart scroll" that accelerates the scroll if you scroll faster like doing a fast swipe on a touchscreen; unfortunately, there's an annoying, cartoonish boing-boing sound whenever you do this.)I just purchased this mouse so I can't really comment on its longevity but so far, I have to say that I'm quite impressed. This mouse is easily as good as any of the many Logitech mice I've used in the past. If it lasts, I'll certainly be back for more.