Build Quality

Overall build quality is very solid. There is no rattle when shaking the mouse. When applying lateral pressure, minor creaking but no 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 only occur if debounce time is set to 0 ms.

Buttons

Main buttons on the Model O 2 Wireless are very good. Both buttons have moderate pre but very low post-travel, though button response is very firm and snappy nonetheless. Despite being visually separated from the shell, button movement is low even when provoked. Button stiffness is medium. A pair of Glorious-branded switches, which are modified Kailh GM 8.0 (80 M), are used here.


Side buttons are good to decent. Post-travel is moderate on the forward and low on the back button, but the back button in particular has noticeable pre-travel, resulting in a mushy button response. The actuation point is mostly even across the entirety of these. Button size and placement are quite good, as actuation is possible rather easily by rolling one's thumb across. A set of Huano switches (green plunger) is used for these.

At the top of the mouse is a button for cycling through the set CPI levels, which feels decent. Another Huano switch (green plunger) is used for this one. The slider at the bottom switches between 2.4 GHz wireless, Bluetooth, and the off-state, which works fine.

Scroll Wheel

The scroll wheel is excellent. Noise levels are appreciably low, and tactility is very good, providing clearly separated steps and controlled scrolling. The encoder comes from F-Switch (yellow, green core) and has a height of 11 mm. The middle (scroll wheel) click requires medium force for actuation. Yet another Huano switch (green plunger) is used here.

Surface

The Model O 2 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 Wireless is reasonably 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 relatively spacious main PCB, which has been affixed to the bottom with four screws. The MCU is a PixArt PAR2862QN. The production date of all PCBs is the 44th week of 2022.


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