SL7550 SL7580 SL7590 SL8050 SL8550 SL8550e SL300 SL500 SL4000 SL4010 SL1600 SL1K SL1M. -In-Line PTT&Mic. Comfortable & Sensitive PTT Button -Quick-Disconnect Acoustic Tube Made of Surgical Grade UV Resistant clear tube from Germany.
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