Wireless Headphones - with microphone, True Wireless earplugs, closed construction, Bluetooth 5.0, track shuffle, taking calls, with volume control, IPx5 certification, frequency range: 20 Hz-20000 Hz, sensitivity: 97 dB/mW, impedance: 32 Ohm, battery life of up to 30 hr(s) (8 hr(s)+22 hr(s))