PU IP54 Waterproof Headph1 in-Ear Air Headset Accessory for ICOM IC-M33 M25 M34 Surveillance Headset Earpiece with Clear Acoustic Coil Tube Earbud Audio Kit In-ear design, not easy to fall off when using and with noise reduction function. IP54 waterproof headset, high quality sound quality gives you a clear call. The sound is clear and sonorous, which is very suitable for using at sea.