There is an on/off switch on the bottom and the receiver is held into the bottom (flush) by what seems to be a magnet (very cool and smart).
Very snappy and responsive, the dpi switch is easy enough to notice between 600dpi and 1000; 600 feels like you are playing drunk, so I'm not sure I will be using that; Lightweight, the overall feel of this mouse is light, responsive and easy to maneuver
Ambidextrous design lacks support and comfort; but I haven't really much been bothered by it