Xiaomi Mi ZBW4326TY Piston In-Ear Headphones Pro Dynamic + Balanced Armature Hybrid Drivers with Remote and Mic, Silver A richer music experienceOne set of headphones, two different sounds, dynamic(deeper bass) + balanced armature drivers(richer treble), metal sound chamber, 20-step process. Balance armatureA patented hybrid driver to let high notes sing and produces greater fidelity even for faint, high notes in a song. DynamicIn order to deliver a superior sound in the mid and bass ranges, we sandwiched an aerospace-grade metal composite layer inbetween two PET layers. This preserves the outstanding treble responses of metal, while improving richness in the lower ranges. Four-time Grammy award winning tunerLuca Bignardi, to perform a subjective acoustic tuning for Mi In-Ear Headphones Pro. Ear budsQuality silicone ear buds available in 3 sizes(XS/S/L) so that you can find the perfect fit. Connectivity technology : Wired