Build Quality

Overall build quality is very solid. There is no rattle when shaking the mouse. When applying lateral pressure, no creaking or flexing of the shell can be observed. Activating the side buttons by squeezing the sides is impossible. Lastly, accidental clicks when slamming down the mouse do occur, albeit only if debounce time is set to 0 ms.

Buttons

Main buttons on the Model O 2 Mini Wireless are good. Pre and post-travel are moderate, resulting in a fairly firm and snappy button response nonetheless. The actuation point is even across the entirety of these. Being visually separated from the shell, button movement is moderate when provoked. Button stiffness is medium to light. A pair of Glorious-branded switches, which are modified Kailh GM 8.0 (80 M), are used.


Side buttons are good. Pre-travel is low to moderate, whereas post-travel is very low, though button response isn't particularly pleasant. Button size and placement are good, as actuation is possible rather easily by rolling one's thumb across. A set of 2-pin low-profile switches from Kailh (white plunger) are used for these.

At the top of the mouse is a button for cycling through the set CPI levels, which feels decent. A 2-pin low-profile switch (white plunger) from Huano is used for this one. A slider switching between 2.4 GHz wireless, Bluetooth, and off-state is found at the bottom, which works fine.

Scroll Wheel

The scroll wheel is very good. Noise levels are appreciably low, and tactility is above average, as the individual steps are rather well-separated. The encoder comes from F-Switch (yellow, green core) and has a height of 10 mm. The middle (scroll wheel) click requires medium force for actuation. A Huano switch (green plunger) is used here.

Surface

The Model O 2 Mini Wireless has a matte surface all over. Grip is fine, and it doesn't attract fingerprints or dirt too much. It is easy to clean, and there are no signs of wear left after doing so. All in all, excellent materials.

Button Sound Test

Disassembly

Disassembling the Model O 2 Mini Wireless is easy. First, all skates as well as the screws beneath them need to be removed. The top and bottom shell are readily separated now, but some caution is advised to prevent ripping any cables.

The internal design is reasonably efficient. The top and side buttons sit on their own PCB screwed into the top shell and connected through a ribbon cable with the main PCB, along with the battery. The left and right-side LED strips are likewise connected through ribbon cables. Everything else sits on the packed main PCB, which has been affixed to the bottom with three screws. The MCU is a PixArt PAR2862QN. Production date for the side-button PCB is the 22nd week of 2024, whereas the main PCB has been manufactured during the 45th week of 2023.


As for the soldering and general quality of the PCB, I'm unable to find any noteworthy flaws.