Sensor

Logitech's HERO (High Efficiency Rated Optical) is one of the most advanced sensors currently available. It has the same level of performance as the PixArt PMW3366, yet its power consumption is ridiculously low compared to the PixArt sensor (about 10% of its power consumption). Its low power consumption makes it an ideal choice for a wireless mouse. I could not detect any anomalies during my testing and gaming sessions with the PRO. Every movement tracked flawlessly and most responsively. Logitech's Lightspeed wireless technology is truly remarkable, as the graphs under the input lag section will show.

The nominal maximum tracking speed and acceleration values are 400 IPS and 40 G. The resolution can be set from 100–16,000 CPI in increments of 50 CPI. The available polling rates are 125, 250, 50, and 1000 Hz. Lift-off distance is low as well since the sensor didn't track from a DVD in height (roughly 1.2 mm). These measurements were made on a plain black cloth mouse pad.

Paint Test

There is no jitter on the reasonable CPI steps, or unwanted angle snapping and measurable (or audible) sensor lens rattle.

CPI Divergence

CPI accuracy is good; deviations are within reasonable bounds. Please note that this test is not 100% accurate, but resembles reality well.

Perfect Control Speed

Nominal maximum tracking speed is ridiculously high, being over 10 m/s. That is a value you will certainly not hit in any situation ever while gaming, browsing, or basically doing anything useful with the mouse.

Speed Related Accuracy Variance

This test shows the sensor's accuracy at different speeds. You can see me doing a fast swipe to the right before I slowly slide the mouse back to its original position.


Here is the same test done with the MouseTester software.

Polling Rate

All set values seem to be perfectly stable; there are no suspicious outliers after multiple tests since the ones you see are mere measurement errors.

Input Lag

The PRO has pretty much no input lag in wireless mode at all; the measured 0.5–1 ms is something I can safely call negligible. Furthermore, there is no smoothing for extra input lag on any of the CPI steps, which is really good.

Battery

There is a 240 mAh battery inside the mouse, located a tiny bit towards the back. With any kind of lighting off and a 125 Hz polling rate, the battery can last 111 hours, but generally, you don't buy a high-performance gaming mouse for that. On 1000 Hz, battery life is about 60 hours in total, but this may vary on your lighting settings. With lighting on the battery lasts 48 hours. This means you can play quite a lot before you have to connect the mouse to its charger cable. Of course, you can continue using the mouse once it is connected as well, so there is no downtime at all.

Moreover, the mouse supports Logitech's PowerPlay wireless charging system. That means if you have a PowerPlay-ready mouse pad, the mouse can simply be charged by using it as there are two magnets inside the mouse (below the detachable lid) that induce electricity by movement.