A mouse including a housing, an image sensing element, a lens, or a laser Doppler cursor positioning sensor; a light-transmitting hole is located where the housing is intersected with a third plane, the third plane is defined by an edge intersecting a first plane and a second plane and a halving line of an angle of the first plane and the second plane; a light source is provided and configured to emit a light beam from the light-transmitting region to the working surface, and the lens is configured to focus a reflected light of the light beam on the working surface to be transmitted to the image sensing element through the light-transmitting hole; or the laser Doppler cursor positioning sensor is configured to project a light from the light-transmitting region to the working surface, and a reflected light is also fed back to the sensor through the light-transmitting hole.