This is the OTS Earphone and Microphone Assembly-2 (EMA-2) Hi-use Communication Module Features: Earphone and microphone assembly designed for all Interspiro full face masks Push-to-talk control (not used in hardwire applications) Hi-USE connector ME-16R Hot MicA(R) noise canceling, salt-water resistant, pressure-resistant studio quality microphone OTS EMA-2 Hi-Use Communication Module is designed to allow the user to connect either Hard-wire or Through-water communications to a helmet or full face mask (FFM). Due to the many styles of FFM on the market, OTS offers a wide variety. The configurations can be endless depending on the application. The following configurations are the most commonly used. Custom Earphone/Microphone (E/M) Assemblies can be manufactured upon request. - ME-16R Hot MicA(R) noise canceling, salt-water resistant, pressure-resistant studio quality microphone.- Super Mic is a water proof, pressure tolerant ceramic microphone with a compact, lightweight design and noise cancelling properties reducing background noises for clearer communications