Koss BT540i Full Size Bluetooth Headphones, Black with Silver Trim

(as of UTC – Details)

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