Sensor

VicTsing decided to go with a PixArt PAW3212 sensor, which is an office-grade optical sensor. I would absolutely advise against any sort of gaming with it—this is not a gaming mouse, after all. While rather precise, it's not the most responsive sensor I've ever tested by a long shot, and very slow motion might give it a hard time. You can set its resolution to 800, 1,200, 1,600, 2,000, and 2,400 CPI, and the polling rate is on 250 Hz by default, which comes to 4 ms of nominal response time.

Battery and Wireless Data

The MM057 operates with a single AA battery, and the company claims that it can last for a very long time since the mouse consumes very little power. Since the sensor is definitely a power efficient model and doesn't have a high response rate, I'm sure this is true—I would highly advise going for a lithium battery for less weight and long-lasting usability, though. The mouse also has a sleep timer of 8 minutes, so if it isn't being used, it won't drain the battery.

Paint Test

There is no jitter on the reasonable CPI steps or any sensor lens rattle. There is a minuscule amount of angle snapping (or I just suddenly got very good at drawing straight lines), but it's negligible, especially for office use.

Perfect Control Speed

Perfect control speed (or PCS for short) is very low on this sensor and does seem to correlate with the set resolution. On 800 CPI, it seems to exactly be 1 m/s, and by the time it reaches 2,400 CPI, it's only about 0.34 m/s, which means it's easy to make it malfunction during regular use.

Polling Rate, Stability

The polling rate is 250 Hz by default. You can allegedly change the polling rate to 125 Hz somehow, but I didn't find any options to, and there's no information about it on the product page or inside the quick-start guide. As for stability, I experienced some periodic drops to roughly 190 Hz, but this didn't seem to cause any errors as the cursor wasn't skipping during these hiccups.

Wireless Latency, Responsiveness

Wireless latency is quite high on this model unfortunately, but I expected it to be since the mouse is situated in such a low price category. I measured about +9 ms in comparison to a Logitech G MX518 running on 250 Hz. This means there's about 12–13 ms of input lag compared to a wired mouse with a polling rate of 1000 Hz.