The aluminum die cast body produces pure, vibration-free sound. The DRiV sound driver with computer aided designed precision winding of voice coils creates distortion free and balanced sound. It covers full audio frequency range of 20-20,000 Hz frequency range. It includes custom fit noise isolation ear buds (3 sizes: S,M,L). It uses tangle free flat cable with negligible resistance of the cable wires for high fidelity sound. Compatible with all iPhones and most smartphones.