Heavy Duty IP68 Submersible Speaker Mic for Portable Radios. The TW-400 is the perfect speaker mic for noisy, heavy duty industrial enviroments. This speaker microphone head has a listen only audio jack located on mic head and a large PTT button that is easy to activate with or without gloves on. The TW-400 features an oversized cable for durability and a molded pull tab for easy insert and removal of the connector to the radio.
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