Auvio Folding Heaphones with Mic - Black 40mm dual drivers provide awesome sound with frequency response: 20-20,000Hz (speakers); 50-10,000Hz (mic) Distinctively designed with soft black, stylish rubberized finish Microphone built-in to allow you to make and receive phone calls Downloadable FREE Auvio EQ App to customize your sound Lightweight design provides comfortable listening for hours