Sharper Image SBT559BK Universal Wireless Bluetooth 4.0 Headphones with Mic, Black Great music deserves a great pair of headphones, and these Premium Sound Wireless Headphones are exactly what you need Stylish and streamlined, they deliver superior audio that's full and rich, with deep bass and clear highs Connect them to any Bluetooth enabled device to wirelessly control music playback, and even answer phone calls Cushioned ear cups block out ambient noise, while the padded headband is adjustable and foldable for easy storage and portability Technical specs: Bluetooth version 4.0, battery capacity 300mAh, work range 30 Ft, standby time 80 Hours, play/talk time 10 Hours, frequency range 20-20000 Hz, sensitivity 1053dB Connectivity Technology: Wireless - Bluetooth 4.0