The Xtrfy M4 Wireless is more than just an M4 made wireless. Much like the M42, the M4 Wireless is modular and can be used with a differently shaped back cover. Another novelty is the movable battery to adjust the center of gravity. On the technical side, PixArt's PAW3370 sensor, Kailh GM 8.0 main button switches, 75 hours of battery life, and a 70 g lightweight construction ensure high performance.