A:AnswerYou can use it as is out of the box, but the Synapse 3 software that allows you to customize it is only available fro Windows. This is something that is conveniently not mentioned.
A:AnswerA mouse can still be safely used without a mouse pad. It should still pick up tracking just as well on any surface, but it will work fine on a smooth solid surface but may not on reflective surfaces such as glass desk.
A:AnswerYes. It has the latest Razer™ optical mouse switch that utilize an infrared light beam to register every click, letting the mouse actuate with an industry-leading response time of 0.2 milliseconds.