GranVela URBANFUN Dual Symphonic-Driver In-ear Headphones Hybrid Balanced Armature+Dynamic Earphones with Microhones Earbuds for iPhone, iPad, Samsung, Android, Music Players and more (Black) Good quality sound ensured by Dual-Driver Hybrid Technology with Premium Balanced Armature & Exclusive Dynamic Drivers. Excellent Divider & 3D Acoustic Chamber Design for Best Combination of Armature & Dynamic. Cable with high pureness core ensures efficient transfer of signal and minimum interference. Low impedance makes the headphones easily driven by portable gears. 12-month worry-free product guarantee for every purchase from GranVela.