Amazon.com: TWAYRDIO 2.5mm Receiver/Listen Only Surveillance Acoustic Tube Earpiece Heavy-Duty Radio Headset (Includes One Pair Earmolds and Nipple Earbud) with Clear Acoustic Coil Tube for Icom Two-Way Radios : Electronics
Walkie Talkie Headset IP54 Waterproof Earpiece for ICOM IC-M33 M25 M34 Ham Radio - AliExpress
Icom Radio Accessories
Mic & Earpiece Radio Kit - Quick Disconnect (Hirose) Icom IC-F306IT/S, – Comm Gear Supply