Patent ID: 8643600

Claim:
A mouse comprising: a casing, comprising: a base plate; and a top cover covering the base plate and defining a receiving hole, the receiving hole comprising a first hole portion, a second hole portion, and a third hole portion arranged from innermost to outermost, the diameter of the first hole portion being larger than that of the second hole portion; a light, the light being capable of being received in the third hole portion; a switch electrically connected to the light and positioned on the top cover for turn the light on and off; and a supporting device movably accommodated in the receiving hole and supporting the light, the supporting device capable of being moved out of the receiving hole, the supporting device comprising a fixing end, a connecting end connected to the fixing end, and an extending portion, the fixing end being capable of moving in the receiving hole, the diameter of the fixing end being substantially equal to that of the first hole portion, the connecting end being capable of sliding out of the receiving hole, the diameter of the connecting end being less than that of the fixing end, and slightly smaller than that of the second hole portion, the extending portion comprising a first pipe and a second pipe, the diameter of the first pipe being larger than that of the second pipe, the diameter of the first pipe being substantially equal to that of the connecting end, one end of the first pipe being rotatably connected to the connecting end, the second pipe being partially received in the first pipe and capable of sliding in the first pipe, the light being electrically connected to one end of the second pipe extending outwards from the first pipe.