Vertex MH-66F4B Rugged speaker microphone
Model Number:  MH-66F4B
Reduce background noise with this noise cancelling, rugged, high performance Remote Speaker Microphone (RSM). With a 360 degree mounting clip, the RSM can be adjusted to meet the unique needs of each user, It is water proof and dustproof. IP57 specifications for dust and water submersions: 3 feet for 30 minutes.