With state-of-the-art microelectronics into a sophisticated compact  2-way radio superior engineering of the PRO510XL will treat your ears to a professional 2-way radio communications system, check me out. 

PRO510XL Features:

• Compact Size
  
• ANL Switch
• S/RF Meter
• Front Mounted Standard 4 Pin Microphone Jack
• External Speaker Jack
• Full 40 Channel Operation
• Palm Sized Electret microphone