TechPowerUp published a review on the Razer Naga V2 Pro
A quote from the article:
The right-handed ergonomic Naga V2 Pro is more than just an MMO mouse: with three swappable side panels each offering a different button layout, up to a maximum of 20, the Naga V2 Pro can adapt to any kind of game. Up to 150 hours of battery life in 2.4 GHz wireless and 300 hours in Bluetooth along with the latest sensor and optical switches round things off.Razer Naga V2 Pro Review