TechPowerUp posted a review on the Endgame Gear XM2we
A quote from the article:
With the XM2we, Endgame Gear finally enables wireless on their ambidextrous XM1r. Equipped with PixArt's PAW3370 sensor, Kailh GO optical main button switches, and pure PTFE feet, the XM2we weighs no more than 61 g, and is said to have a battery life of around 70 hours.Endgame Gear XM2we Review