TechPowerUp published a review on the Xtrfy M8 Wireless
A quote from the article:
Unlike previous Xtrfy releases, the amibdextrous M8 Wireless does both without shell holes and RGB lighting, yet only weighs 55 g. Featuring PixArt's latest PAW3395 sensor, Kailh GM 8.0 switches for the main buttons, and 75 hours of battery life, the M8 Wireless also offers extensive on-board customization.Xtrfy M8 Wireless Review