This is a complete system for secret two way talking. This Neckloop is having two SIM slots and having Volume regulatory buttons for better sound quality as per need of the user. 
 
Key Features -
	
8 Hours of battery backup 
	
2 days of standby 
	
On/Off button 
	
Volume + / - button 
	
two SIM cards at the same time 
	
75 dB mic - ultra sensitive 
	
auto call receiving function
	
Double antena