Sanag B21S mixes bone-conduction transducers with Bluetooth 5.4 and a titanium-memory alloy neckband, plus IPX5 splash resistance and an app with EQ presets. Good for outdoor runners who need ambient awareness and a flexible, stable-fit headset; expect distinctive skull vibrations, open-ear sound leakage, and an app-dependent feature set.
Buy if you want bone-conduction open-ear headphones with Bluetooth 5.4 for outdoor awareness; avoid if you need noise isolation or premium build materials.
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