Coby CVM807 Two-in-One Stereo Neckband Earphone with Hands-Free Kit Headphones are engineered with natural human factors for secure fit and maximum comfort in mind Performance 15mm samarium cobalt drivers for super bass sound "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