The Xtrfy M4 Wireless marks the first step in Xtrfy's quest to make their current-generation mice line-up wireless. And aside from some very minor issues, the M4 Wireless is a most successful undertaking.

Of course, the most interesting part about a wireless mouse is its wireless performance. The M4 Wireless is using the same MCU and firmware solution utilized by the Pulsar Xlite Wireless, and performance is just as excellent. Wireless motion delay is just 1 ms, general tracking great, CPI deviation is wholly nonexistent, and there is no added delay at the onset of motion. Much like the Xlite Wireless, the M4 Wireless also comes with a wireless extender, which I tend to consider an essential addition these days. As on the Xlite Wireless, the only issue I could find is with polling rates below 1000 Hz, which all exhibit periodic outliers in wireless mode even though wired is stable. Thankfully, 1000 Hz shows no issues, and RGB lighting doesn't introduce any instability either. Click latency is likewise very low, clocking in at +2.3 ms (Ikari scaling) at the lowest setting.

The wireless experience itself is equally pleasing: After a minute of inactivity, the mouse turns itself off, which includes the lighting, charging is fast, and the battery capacity fairly high at 500 mAh. The charging cable is the same cable as on the wired MZ1, and thus flexible enough to use the M4 Wireless without feeling restricted while charging. Xtrfy indicates a battery life of 75 hours, which is difficult to verify as the M4 Wireless lacks software and thus a battery charge indicator. However, upon pressing a specific button combination, the current charge status is displayed in an associated color directly on the mouse, and even after 12 hours of continuous use with RGB fully enabled and at a polling rate of 1000 Hz, I never got to see the yellow light indicating a charge level of less than 75%. Hence, it is reasonable to assume that the M4 Wireless easily clears 50 hours of battery life even at those settings. Speaking of the software, despite the lack of one, the M4 Wireless displays almost the same level of customization one would expect from a software solution, aside from button remapping and CPI adjustment, which are difficult to realize through button combinations.

On top of firmware-level customization, the M4 Wireless also introduces further hardware customization options. For one, the back cover can be swapped with a higher-profile one that is also included. While the difference between the two isn't huge, the higher-profile back provides more palm support, possibly making the M4 Wireless a better fit for those who found the original M4 lacking in that department. In addition to this, Xtrfy provides the necessary STP files for the back cover, so one could simply 3D print a piece that suits one's preferences even more. The back cover is secured with three screws, which can be accessed with the included magnetic screwdriver. This works reasonably well, though using magnets like on the Xtrfy M42 no doubt would be the more elegant and thus preferable solution. Another novelty is the movable battery. Typically, wireless designs face the challenge of positioning the battery in such a way that the balance of the entire mouse is kept intact. Xtrfy aims to address this by giving users the ability to move the battery back and forth, which too is done by loosening and securing two screws. While the intent is a noble one, I'm not entirely sure about the execution. Relative to the default position, the battery can only be moved by roughly 5 mm (0.2 inches), which is too little to affect the weight balance meaningfully. In practice, I've found the difference to be subtle at best and overall prefer a design that is well-balanced out of the box, which is in fact already the case on the M4 Wireless. Accordingly, I'm inclined to file this one under gimmick.

Compared to the wired M4, the M4 Wireless actually loses 2 g despite featuring a battery of around 10 g. From what I can tell, no compromises in terms of build quality have been made to achieve that, aside from the already familiar holes all over the mouse. These are of the circular variety, albeit not large enough to be particularly irritating during use. Still, the holes on the side at least could be seen as annoying. The overall build quality is spotless on my copy: There is just minor creaking, no flexing of the shell, and activating the side buttons by squeezing the sides is impossible. Much like on the Xtrfy MZ1, Kailh GM 8.0 switches are used for the main buttons, and they provide the usual firm and snappy response one would expect. That said, the response was a little too firm for my liking on the left button of my copy, as it was significantly stiffer than the right one. A prototype I received earlier didn't suffer from this variance in button stiffness, so I'm inclined to believe the overly heavy left-button switch slipped through QC on my unit. The side buttons present themselves much improved compared to the wired M4 I reviewed back in 2019. Aside from some pre-travel on the back button, button response is firm and quite pleasing overall, complemented by appreciably low post-travel. The scroll wheel is familiar from previous Xtrfy releases and still provides very tactile scrolling at low noise levels unless scrolling down rapidly. The same goes for the feet, which still come in above average thickness and with slightly rounded edges, ensuring great glide out of the box. As always, a set of replacement feet is included.

The M4 Wireless goes for $99.00, which no doubt is a noticeable premium over the $74.95 Pulsar Xlite Wireless or $79.99 Glorious Model D- Wireless. At the same time, the M4 Wireless does offer physical customization options that are entirely absent on either, and is a particularly compelling option for those who dislike mouse software in general as the degree of on-board customization on the M4 Wireless is unmatched among right-handed ergonomic wireless mice. Given the upgrade in capabilities, the price uptick compared to the $59.00 M4 seems fair, too. Accordingly, Xtrfy earns our Editor's Choice for the M4 Wireless as well.

When looking at the competition, there is no shortage whatsoever. However, when narrowing the selection down to smaller-sized right-handed ergonomic wireless mice, the choices are no longer as numerous. Likewise priced at $99.99, the ASUS ROG Keris Wireless lacks a wireless extender, has hot-swappable main button switches, great performance, an appreciably low weight at 79 g, very low click latency, along with very nice buttons and feet, but comes with the non-negotiable Armoury Crate burden. For $89.99, the Cooler Master MM731 provides worse yet still good performance, even lower weight without any holes, optical switches for the main buttons, and a wireless extender, but desperately needs the latest firmware as performance without it applied is disastrous. The already mentioned Glorious Model D- Wireless too can't quite compete in terms of performance, is similarly light, yet doesn't have as many holes, weaker battery life, and suffers from noticeable CPI deviation, for $79.99. At $129.99, the SteelSeries Prime Wireless is the least appealing option, mostly due to the lackluster main buttons and click latency, along with noticeable CPI deviation, which overshadow the otherwise solid performance and incredibly solid hole-free build.