What a sensor does
The sensor is the camera that watches the surface below the mouse. It takes thousands of snapshots every second and compares them to track movement. The quality of that tracking decides how truthful your cursor movement is.
The PAW3395 family
The Pixart PAW3395 is the flagship optical sensor for gaming mice in this generation. It supports up to 26,000 DPI, tracking speeds around 650 IPS and a low power draw. The PAW3395 SE is a trimmed version used in the R1 SE+, still far ahead of office sensors.
Which specs matter
DPI matters little beyond a number. What matters is tracking speed and consistency. If you swipe fast, a low IPS sensor can skip during fast flicks. Consistency matters on different surfaces and when the mouse lifts off and lands again.
- PAW3395: 26,000 DPI, high IPS tracking, low power
- PAW3395 SE: slightly trimmed, still excellent
- DCPI numbers alone do not decide quality
- IPS and consistency matter more for fast play
- The R1 Tri and R1 Pro use the PAW3395 class sensor
Power matters too
A good sensor is nothing if it drains the battery. The PAW3395 family is efficient, which is part of why the R1 series achieves such long runtimes. When comparing mice, look at sensor efficiency as well as raw specs.
The practical takeaway
Do not buy a mouse for a huge DPI number hung on the box. Look for the sensor generation, the ISP rating for fast swipes, and how it performs on your pad. A PAW3395-class mouse like the R1 Tri gives you professional tracking at a very fair price.