Magnificent 2.4GHz Wireless Model O 2 PRO 100M clicks with a 1 ms delay Ergonomic 26K DPI BAMF 2.0 Sensor 57G Ultralight Long Battery Life - Black: Product Playback Video Model D 2 PRO: Realizing ultralight gaming performance With optical switches rated for 100 million clicks and a BAMF 2.0 26K optical sensor for perfect tracking, the D 2 PRO is a lightweight, high-performance gaming mouse. Mouse-han is enhanced by the fully enclosed shell on the previous page.