Emergency Communication and Quick Seismic Damage Investigation Based on Smartphone

Table 3

The tested maximum connection distance and through-walls ability.

Devices	Indoor maximum distance	Outdoor maximum distance	Through walls (load bearing wall)
4s & 4s	45 m	45 m	1
6 & 6	70 m	55 m	1
4s & 6	55 m	50 m	1