This APP has both "S.O.S" and "Rescue" modules:
On the one hand,it can send the S.O.S signal by Wifi access point,especially without network and Mobile Communication;
On the other hand,according Wifi signal to rescue others in emergencies.
Module one: Click the "S.O.S" icon,input information,send the signal and wait for rescue;Tap again to close.
Module two: Click the "Rescue" icon and chose a target from the list， than you can git the signal level,search target by the level.
Tip: "S.O.S" and "Rescue" not available at same time