2-Wire Acoustic Tube Earpiece Clip-On PTT / Mic for Motorola SL Series Radios. Compatible with Motorola SL300, SL500, SL7550e, SL7580e, SL7590e Maxon/TecNet: TPD8124, and TPD8424 Two-Way Handheld Walkie Radios. Acoustic Tube 2 Wire - 1st wire to ear piece, 2nd wire to microphone and PTT. Industry leading 30lb pull strength at both ends of the PTT. Quick disconnect clip – secures the earpiece and provides additional cable strain relief. Twist off acoustic tubes – hygienic quick and easy swap between multiple users sharing equipment. All kits include 2 ear tips - clear and skin colored. 36 Month Rapid Replacement Warranty.