Two-way anti lost, Find each other within range.
 
 
  
 
  
 
  
 
  
Locate the parking site on map before leaving from your car, help you trace back no matter how far you go away.
 
 
  
 
  
 
  
 
  
Works as remote shutter for self-portrait with burst shot.
 
 
  
 
  
 
  
 
  
Trigger on/off the voice recording on the phone underground.