M500 Silent transmits using Rapoo's latest and powerful multi-mode wireless via Rapoo's reliable 2.4 GHz wireless transmission, Bluetooth 3.0 or Bluetooth 4.0. (Smart) allows you to connect simultaneously to up to 3 devices and change (pair automatically) among them. Naturally this mouse also features a fully adjustable 1600 DPI HD sensor and non-slip scroll wheel, making surfing and clicking a joy.