Bone conduction earphones. I used these for about a year while walking, but I'm selling them now that I've stopped. They have a hands-free calling function with a microphone. *Type-C charger not included Model number → W9 Product name → Bone conduction earphones Communication distance → 15m Product weight → 29g Battery capacity → 180mAh Duration → 480 hours The following is an excerpt from the website: 1. Protects hearing: You hear through your bones, so your ears are free, gentle on your ears, and protect your hearing. 2. Going out: You can be aware of ambient sounds while enjoying the rhythm. 3. Open-ear design: Doesn't put pressure on your ears, so your ears won't hurt even after wearing them all day. 4. With Bluetooth 5.2 standard bone conduction earphones, you can enjoy high-quality sound and low latency playback, and a more stable connection even in the city. 5. The bone conduction earphones weigh 29g. This weight is not too light, making them less likely to fall off or get lost when worn, and not too heavy, so your bones on both sides won't get tired or hurt after wearing them for a long time. Also, regarding the fit, the side pressure is not strong and the weight is not felt much, so it's very light and comfortable to wear, to the point where you forget you're wearing them. 6. Equipped with excellent IPX7 waterproof performance, suitable for running in bad weather and outdoor training. It is resistant to water and sweat and is durable. Color: Black Connection type: Wireless Features: Bluetooth, bone conduction