This model is for PT560H and PT580H Plus. The microphone has an adjustable clip at the back for comfortable wearing and positioning. The tactile PTT gives positive acknowledgement to the user that the button has been pressed. The emergency button is on the top of the unit so that it can be easily found. 
  
 
  Specifications of Hytera SM18N3 
  Specifications 
  Dimensions 86.3* 62.1* 43.8mm 
  Weight about 160g 
  Color black 
  PTT Key available 
  Emergency Key available 
  Accessory Interface 3.5mm 
  Connector 16-pin connector 
  Microphone Sensitivity -42±3dB@1kHz 3.0V 2.2K,0dB=1V/Pa 
  Speaker Power 1 W (rated),1.5 W (max.) 
  Speaker Impedance 8Ω±15%@1.5kHz 
  Speaker Frequency Response 93±4dB@1kHz 1w/30cm 
  IP Rating IP57 
  Operating Temperature -30~60℃ 
  Storage Temperature -40~85℃ 
  
 
  Hytera Communications Corporation Limited (SZSE: 002583) is a leading global provider of professional communications technologies and solutions. With voice, video and data capabilities, we provide faster, safer, and more versatile connectivity for business and mission critical users. We enable our customers to achieve more in both daily operations and emergency response to make the world more efficient and safer.