A mouse includes a housing, a button, and a slider. The button is pivotally connected to the housing. The button includes a first abutting portion. The slider is slidably engaged with the housing. The slider includes a second abutting portion. When the slider is located at a first position relative to the housing, the first abutting portion abuts against the second abutting portion. When the slider is located at a second position relative to the housing, the first abutting portion is separated from the second abutting portion.