Enjoy beverages while listening to music with this TWS Bluetooth earphone vacuum flask. It features a 550ml stainless steel vacuum flask with a Bluetooth earphone charging dock as the lid. The Bluetooth earphone is equipped with a Φ6mm speaker unit and can provide an outstanding music experience. Speaker: Φ6mm. Transmission: 10-15 meters. Rechargeable battery in earphone: 30 mAh /piece. Rechargeable battery in charging box: 300 mAh. Music play time (TWS): approximately 3.5 hours. Charging time for earphone: approximately 1 hours. Bundled with a charging box lid, USB cable and user manual in a gift box. Bottle capacity: 550ml. Magnetic earbud docking and charging. Auto power-on, auto pairing. Binaural (stereo) call. Low power consumption. Stainless steel vacuum flask with a Bluetooth earphone charging dock as the lid. Provide an outstanding music experience. For enjoying beverages while listening to music.