Waterproof Bone Conduction Bluetooth Headphones Open-Ear with Built-in Mic

IKF Bone Conduction Headphones – Bluetooth 5.3 with Built-in Mic, Sweatproof & IP68 Waterproof, 6-Hour Battery Life, Lightweight Open Ear Headphones for Running, Sport & Fitness. Wireless Bone Conduction Headphones – IP68 Water & Dust Protection.

eBay