Engineered with Natural Human Factors for Secure Fit and Maximum Comfort in Mind.Performance 15mm Samarium Cobalt Drivers for Super Bass Sound.3.5mm Gold-Plated Stereo Plug "Hands-Free" Kit."Hands-free" Communication for Cellular and Cordless Phones.Automatic Music Distortion Feature when Incoming Phone Signal is Detected, Highly Sensitive Omni Directional Electret Condenser Microphone for Best Reception Coby Electronics is a "prime" manufacturer of quality consumer electronics that are designed to provide years of outstanding performance and sound reproduction. Unlike many other consumer electronics companies, Coby possesses an in-house art and design department and an in-house research and development department. These departments have been responsible for creating award winning packaging designs and exclusive and patented products.CV-M809 is 2-in-1 digital stereo earphones with hands-free kit. PRODUCT FEATURES:Engineered with natural human factors for secure fit and maximum comfort in mind; Performance 15mm samarium cobalt drivers for super bass sound; 3.5mm gold-plated stereo plug hands-free kit; Hands-free communication for cellular and cordless phones; Automatic music distortion feature when incoming phone signal is detected; Highly sensitive omnidirectional condenser microphone for best reception; 2.5mm plug fitting most cellular and cordless phones.