Wireless Headphones - with microphone, True Wireless earplugs, closed construction, Bluetooth, supports SBC, active noise control (ANC), track shuffle, taking calls, IPX4 certification, frequency range: 20 Hz-20000 Hz, sensitivity: 118 dB/mW, impedance: 32 Ohm, converter: 13mm, battery life of up to 40 hr(s) (10 hr(s)+30 hr(s))