In an indoor semi-open scene, there is a "colored thick glass" between the mobile phone and the AP. The parameters for calculating the signal field strength are shown in the figure. Without…

In an indoor semi-open scene, there is a "colored thick glass" between the mobile phone and the AP. The parameters for calculating the signal field strength are shown in the figure. Without considering other factors, if the field strength at the location of the mobile phone meets the requirement of 2.4G RF signal field strength of -65dBm, the maximum transmission distance attenuation value is () dB.