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CAUTION: The BT-583 will mute both the internal microphone and speaker of your portable radio if no wireless audio accessory is paired with the device and no wired audio accessory is connected to the QuickDisconnect port
5mm audio connector
Squelch Level Adjust
Time-out Timer
of heavy-duty use
Impact Gold Series Medium Duty Two-Way Radio Remote Speaker Mic with 3.5mm Accessory Jack M2-GRSM-HD1 HYT TC508 CAUTION: The BT-583 will muteThe Impact HD1 is a medium duty design for the professional user who needs a tough mic at a great price! The GRSM HD1 speaker mic is commonly used by hotel and hospitality users as well as warehousing and distribution centers and retail boxstores. Features: Strong TPU coil cable IP54 Rated Splash proof Large, easy to use Push to Talk (PTT) 3. 5mm audio accessory jack Two year manufacturer's warranty Fits: GP1280, GP140, GP320, GP328, GP329, GP338,