16 programmable keys. Whether you just want to assign the most important commands or get in full with macros, you have all the commands you need at hand – this is individual control in every situation. Ergonomic design with 85 g total weight. From the placement of the programmable 12-key thumb box to the ergonomic shape of the case, this mouse feels completely natural, fits perfectly in the hand and is comfortable to hold and use. OPTICAL MOUSE SWITCHES FROM RAZER THE 2nd Generation. Each click is executed within 0.2ms without bounce delay, so you can rely on up to 70 million clean clicks - a faster, more robust design that puts an end to unintentional double clicks.