TWS Bluetooth 5.0 Stable Connection with DSP Noise Cancelling. Automatic Pairing (Second Connection) Bilateral Call, Double-ear multifunction button, anti-missing.  12h long battery life with Charging box. IPX4 waterproof, no fear of rain and sweat. Comfortable to wear, self-adjusting, not easy to fall off. Summon voice assistants - Siri, Google Assistant, etc. and voice control your mobile phone.