Features: New Sound Tuning Technology: Configuration determines the benchmark of sound quality, turning to enhance the configuration of the play. The third generation of super new sound tuning, comprehensive consideration of the advantages of the sound generating unit and cavity structure, easily restore a sense of high-definition big picture rich in live atmosphere.  6μm Polymer Composite Diaphragm: Different from the market thin polymer composite diaphragm, optimized ring fan blade cutting pattern, can greatly enhance the low frequency dynamic feedback, improve distortion, retain the low frequency dive, bring a sense of power  surging low frequency.  Metal Pinnacle Craftsmanship: QKZ's acoustic process is the pinnacle of the ZAX2, with a matte, streamlined metal finish inspired by sports cars, and a precision polishing process that spared no expense.  Ergonomic Shape for Comfortable Wearing: We understand wearing comfort is one of the biggest concert for most in-ear earphones, thus we have paid high attention to this to present you a comfortable, secure fit and noise isolation earphone while it also possesses astonishing industrial design and beauty. ZAX2 could be the earphone on-the-go or something for professional scenario.  Outstanding Performance: Daily street use of lightweight cell phones or MP3, easy to push, always listening.     Specifications: Product: ZAX2;  Sensitivity: 109dB±3dB;  Inpedance: 17Ω±10%;  Frequency: 10hz-20khz;  Pin Type: 0.75mm;  Interface Type: 3.5mm;     Package Included: 1 pair * Earphones;  1 * Braided cable;  6 pairs * eartips(different sizes)