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Designed to save your department money. Our durable listen only acoustic tube earpiece has a 14" coiled cord with a 2.5 or 3.5mm earphone jack (Signal 21 uses 3.5mm). Compatible with our Signal 21 shoulder microphones as well as most Motorola speaker microphones. 2.5mm is used on most Kenwood Brand Shoulder Mics. 3.5mm is used on many devices including most Motorola Shoulder Mics.
