Lightweight bone conduction earphones with waterproof function and volume control buttons. I used them once to check, but bone conduction doesn't suit me, so I couldn't use them. I don't know the details, so please purchase if you can understand from the photos. Please ask any questions before purchasing. No claims and no returns, please. ↓ I think this is it: Bone conduction earphones bluetooth 5.4 swimming IP68 fully waterproof 32GB built-in memory, up to 8000 songs, bone conduction earphones, bluetooth, pool, wireless headphones with microphone, 8 hours of continuous playback/call, swimming cap/goggles/helmet compatible, running, cycling, sports headphones, gray black Brand: Kemeskin Color: Black Headphone type: Completely wireless Model name: S18 Connectivity technology: Wireless Thank you for viewing.