The Oppo Enco X are packed to the brim as they come with touch controls, noise cancellation, wireless charging, and IP54 rating. With the support of LHDC Bluetooth audio codec, they can perform the potential of Oppo‘s DBEE3.0 sound system, providing the beauty of music. Also claimed to offer up to 25 hours of battery life. Key Specs •Driver size: 11mm dynamic + 6mm balanced membrane •Speaker sensitivity: 104dB @1KHz •Frequency response range: 20Hz ~ 20kHz •Bluetooth codecs: LHDC, AAC, SBC •Bluetooth version: Bluetooth 5.2