Wireless Headphones - with microphone, True Wireless earplugs, closed construction, Bluetooth 5.1, supports A2DP, AAC, AVRCP, HFP, HSP and SBC, voice Assistant, track shuffle, taking calls, with volume control, frequency range: 20 Hz-20000 Hz, converter: 8mm, battery life of up to 25 hr(s) (5 hr(s)+20 hr(s))