Feature:1. PVC MATERIAL: The acoustic tube earpiece is made of PVC, which is sturdy and stable, and the eartips fit snugly into your ear canal. Tiny speakers is located on the side of the PTT switch.2. HIGH QUALITY TRANSMISSION: The thin, flexible, transparent sound tube transmits sound with high quality, and the transparent tube is not easy to attract attention.3. HIGH PERFORMANCE: The two wire headphone set offers outstanding durability, reliability and performance. Ideal for security applications requiring sound clarity and durability.4. EASY TO OPERATE: Two wires protrude from the PTT switch, one is connected to the sound tube adapter and the other is connected to the radio, which is easy to use.5. DUAL RIGHT ANGLE: Headphone 2.5mm Stereo (thimble), Microphone 3.5mm Stereo (bottom pin). For ICOM IC‑F4TR IC‑F10 IC‑F20 IC‑H2, for ALINCO Radio.Specification:Item Type: Acoustic Tube EarpieceMaterial: PVCColor: Black + WhiteLoudspeaker Length: Approx. 48cm/18.9inLine Length: Approx. 91.5cm/36.0inApplicable: For ICOM IC-F4TR IC-F10 IC-F20 IC-H2, for ALINCO Radio Package List:1 x Acoustic Tube Earpiece2 x Earplugs1 x CableNote:Please allow some errors due to manual measurement.