Inside the Siege M04
Under each of the feet is a screw which needs to be removed to get to this point. In the top half, there is a PCB which contains the switches for the DPI selector as well as the pair of side buttons. The lower half includes everything else, and we see no additional weighting used anywhere inside of the Siege M04.
The small PCB taken from the top half of the mouse has three switches in it, one of which is under the PCB. All three switches are black cased, blue stem "iB" branded switches. They require a fair amount of pressure to actuate and deliver a satisfying click once the actuation point is hit.
It is hard to see, but under the left button on top of the Siege M04, Sound Blaster chose to fit this mouse with a DFC-F-K(50M) Omron switch. Even though these switches sport blue stems, the feel is very similar to other Omron switches, and the report is the same as well. Another thing worth mentioning is the use of an ALPS sensor for the scroll wheel versus the TTC we typically see.
The sniper button is backed with another black cased, blue stem, "iB" branded switch. It too requires force and reports with a click just like the others.
In control of all of the functionality of the Siege M04, we find this STMicroelectronics STM32F chip. This tells us that this is a 32-bit ARM Cortex M4, and is also the location in which your changes to the mouse will be saved from the software.
Just when we thought there was not a choke in line for the USB cable, at least from what we could see of the cable on the outside, we find that to be wrong. As the cable is about to make the connection to the PCB, the wiring is run through a ring-shaped Ferrite choke.
Under the right button on top of the Siege M04, we find the second Omron switch used in this design. It is much easier from this angle to read and verify that these are indeed DFC-F-K(50M) switches used. This will give you many years of use out of this mouse, more than double that of most other mice.
To gain a view of the sensor employed in the Siege M04, we did have to remove the main PCB from inside of the mouse to expose the third PCB incorporated into this layout. On this last PCB, we found the Pixart PMW3360DM optical sensor in charge of tracking with a DPI range of 100 to 12,000 DPI.
Once we got the Siege M04 back together and connected, we are greeted with a mode of LED lighting which uses the full-color spectrum of options, and the lighting circles the mouse in a counter-clockwise direction in the white plastic along the bottom. When you select the DPI levels, this band will change yellow for the lowest one, blue for the middle one, and green for the highest setting. As for the X on the top of the heel, it is always red no matter what you do.
The color wraps the entire lower band of the Siege M04, as we can see, it is lit in various colors at this time too. The scroll wheel is also backlit, but it is hard to discern from this angle, but we can assure you that the constantly while LED under it can be seen in regular use all of the time.
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