The invention mainly relates to a mouse with a capacitive tact switch incorporated thereto. When the user touches the mouse, the capacitive tact switch in the mouse will sense the proximity and inform the host control circuit immediately. Contrarily, when the user's hand is leaving the mouse, the capacitive tact switch will inform the host control circuit to shut down completely the most power consuming parts such as RF module, CMOS sensor thereby the goal of power saving can be achieved.
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