Easy Kz Ed9 Heavy Bass Hifi Dj Stereo Earplug Noise Isolating Hifi Earphone with Microphone (silver with microphone) 1. Upgrade tuning nozzles, for different musical styles The bass and balanced nozzles allow users to tune its audio settings by switching different nozzles. Bass for a bass-enhanced experience, Balance for full-spectrum smoothness. 2. Innovative T shaped pole piece driver unit The all new driver unit effectively eliminates the negative pressure in driver, providing clear, soft feel of sound and better extension of vocals. 3. New vibrant PEK diaphragm With extremely sensitive and fast response force, this KZ ED9 headphone has purer vocals, dynamic texured bass. 4. Musical instruments level acoustics brass housing, The copper housing enhance the resonance effect, the tone is clearer and brighter, reproduce the fresh thorough and extremely dynamic sound. 5.With the stylish design and high-end sound quality,this earphones are designed for the latest generations of iPod, iPhone, and iPad. They work with all Androids, tablets, mp3 players, and related devices.