Wireless Headphones - with microphone, True Wireless behind-the-ear, open construction, Bluetooth 5.1, supports AAC and SBC, track shuffle, taking calls, with volume control, IPx5 certification, frequency range: 20 Hz-20000 Hz, sensitivity: 103 dB/mW, impedance: 16 Ohm, battery life of up to 32 hr(s) (8 hr(s)+24 hr(s))