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 (Green) 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 to ensure efficient transfer of signal and minimum interference. Low impedance, can be easily driven by portable gears. Comes with 12 months worry-free product guarantee for every purchase from GranVela.