This slide shows the VL6180X module. It is a 12-pin device with package dimension of 2.8 X 4.8, 1 millimeters high. As shown on the slide, on the left-hand drawing, starting from left to right, the smallest hole is the sensing area, and next to it is the ambient light sensing area. The next mark, is a manufacturing process plastic gate marking. All the way to the right, is the IR light source emission aperture. The VL6180X part is an QFN reflow-able. The reflow profile that should be used with the VL6180X is located in the datasheet found on ST.com.