TechPowerUp posted a review on the Fantech Helios II Pro
Fantech Helios II Pro Review
Fantech's latest release is the ambidextrous Helios II Pro. Weighing no more than 55 g, the solid-shell Helios II Pro comes with PixArt's PAW3395 sensor, TTC optical main button switches, Bluetooth connectivity, and through a separately available dongle, true 4000 Hz wireless polling can be enabled.
