TechPowerUp reviewed the Fantech Helios Go XD5
A quote from the article:
Somewhat similarly to the Ninjutso Origin One X, the Helios Go XD5 is a smaller-sized recreation of Microsoft's ever-popular IntelliMouse Explorer 3.0. Equipped with PixArt's PAW3370 sensor, the 72 g Helios Go XD5 is said to have a battery life of up to 40 hours. Kailh GM 8.0 switches are used for the main buttons, complemented by pure PTFE feet.Fantech Helios Go XD5 Review