A wireless computer mouse includes a first operating portion, a second operating portion, a circuit board, and a switch. A pair of LEDs is mounted on the circuit board. One of the LEDs corresponds to the first operating portion, and another LED corresponds to the second operating portion. An optic member is mounted on the circuit board. The optic member includes two opposite reflecting portions. Each of the reflecting portions corresponds to one LED, and each of the reflecting portions is configured to reflect the light of the corresponding LED to highlight a surface underneath the mouse. The switch is configured for selectively enabling the first operating portion and the second operating portion. When the first operating portion is enabled, the LED corresponding to the first operating portion lights. When the second operating portion is enabled, the LED corresponding to the second operating portion lights.