Koss Full Size Bluetooth Headphones, Black with Silver Trim

Cut the Cord and stay connected with the BT540i Bluetooth Headphones by Koss, inventors of the world's first SP/3 Stereophone in 1958. Features: * Wireless Bluetooth Sound with AptX integrated electronics for enhanced acoustical clarity * On-Board Control to change volume, tracks, and answer calls * Soft Memory Foam Cushions create the perfect seal and long lasting comfort * On Board Microphone * Koss PLX40 Dynamic Element precisely tuned to feature crisp highs, robust mids and smooth lows for the ultimate personal listening experience * Connectivity technology: Bluetooth, NFC * Frequency Response - 10-20,000 Hz and Impedance - 16 ohms