1 9D surround sound, 5.0 dual-ear chip, large capacity, true wireless Bluetooth headset.2 Graphene bass diaphragm, HIFI high-frequency technology, 10MM dynamic speaker unit.3 Two connection methods: single / double free to use, single ear listening to enjoy alone, listening to HiFi stereo in both ears.4 Binaural HD call, 5.0 automatic boot pairing, CVC8.0 built-in active noise reduction IC.5It features binaural HD call, play pause, answer hang up, summon Siri, volume adjustment, up anddown song switching, automaticboot, automatic pairing, intelligent noise reduction, no delay in the game.