This mouse was VGP-UMS31 by Sony and produced in 2009. The appearance is round and integrated, the hand feeling is relatively light, and the size is also small, which feels more suitable for girls. The upper edges of the details are stitched well, and a section is also made on the left and right sides to make other fingers better placed.

There are a total of four screws in the whole machine, which are located under the four foot stickers. The mouse is composed of 3 shells. The upper and lower covers and the circuit board are fixed with the same screws, and the top cover is fixed with a buckle and the upper cover. In addition to the housing, there is a circuit board and an optical lens, and the composition is relatively simple.

After seeing the disassembly of other mice, it is found that after other mice may open the shell, the circuit board needs to be fixed with another screw to the bottom plate. However, this mouse simplifies the structure and uses the same screw to limit and fix the circuit board and the upper and lower covers together, which is quite good.

The details of the wiring are also well designed, whether on the circuit board or on the bottom shell, the position and fixing of the wiring are considered.

The top cover and the upper cover are mainly assembled with 3 buckles. In fact, there are still 2 buckles in front to limit the up and down displacement of the keys.

The roller part is a rubber ring sleeved on a concave shaft. The left end of the shaft is hexagonal, and it can be driven to rotate by being stuck in the potentiometer.