Walkman 

digital media player 
Bluetooth  Network :  turn on ,it receive voice from mobile phone or other device 
FM radio transmitting :  sends voice to different earpice by FM radio , max. 60 meters , support multi earpiece within radius of 60 M.

Network : Bluetooth  
Work distance :
    in open air without obstacle : 60meters or more 
    in building : 2 floors penetrate ( with stairway within 5 meters ) ;
Battery : Built-in , support call talking 3-4 Hours around ;
Language : Chinese 
Earpiece quantity to support : Many  .
Earpiece battery type :  458 
Earpiece Battery working time : 10 hours