Wireless Headphones - with microphone, True Wireless earplugs, closed construction, Bluetooth 4.2, supports AAC, aptX and SBC, power bank, track shuffle, taking calls, with volume control, IPX4 certification, frequency range: 5 Hz-21000 Hz, converter: 7mm, battery life of up to 36 hr(s) (9 hr(s)+27 hr(s))