Have you ever notice about the meaning of number in your camera phone?

For example in k750i there are number :"AF 4.8 mm 1:2.8", so what's the meaning of the number?"

The 4.8 mm meant that the camera focus has minimal distance of 4.8 mm, the more smaller the number show the macro capacities for digital camera, While 2.8 indicate the aperture / diaphragm of the camera. aperture / diaphragm  control light that will enter to the camera lense, the smaller the number, the more light can enter the lense.