Black 2.4GHz technology Anti-interference and power saving ; 1200 dpi Infrared sensor technology (\"Green Mouse\" at lower power consumption) ; Power saving switch (Extends battery life up to 18 months) ; Two-in-One slot (Storage for receiver and Stick-N-Go mount) ; Stick-N-Go (Avoid dropping when moving arround office) ; The contoured shape is suitable for either hand ; Three (left, right, middle button with scroll)