• Standard Horizon CMP460 Speaker / Microphone
• Allows communication while the radio is in a holster or clipped to the user's belt
• Submersible and safe for hazardous environments
• All Standard Horizon Safe Handheld VHFs with a Speaker Mic Port(This Mic has also been tested and approved for use with the Standard Horizon HX400IS and HX370IS (Intrinsically Safe) handheld VHFs)