Wireless Headphones - with microphone, True Wireless pits, closed construction, Bluetooth 5.1, supports AAC and SBC, active noise control (ANC), track shuffle, taking calls, with volume control, IPx5 certification, frequency range: 20 Hz-20000 Hz, sensitivity: 35 dB/mW, battery life of up to 26 hr(s) (6 hr(s)+20 hr(s))