The Bluetooth V4.2 Stereo Headphones 09 allows you to enjoy digital-quality music wirelessly and convert between music and phone calling mode freely and by the click of a button. Features: - Bluetooth stereo headset with mic - Noise Reduction - 3D Stereo sound - Travel Friendly Folding design - Adjustable headset with soft padded earcups - Rechargeable battery via included USB - Supports bluetooth stereo devices to receive music from laptop, PC, tablets, iPhone, Blackberry, Android and or any device that supports bluetooth stereo audio. Specifications: - Type: Bluetooth V4.2 - Frequency Response: 20Hz - 20kHz - Frequency Range: 2.4Ghz - 2.48Ghz - Operating distance: Up to 10m (free space) - Standby time: 110 hrs - Ear Pad Diameter: +/- 80mm