Logitech Wireless With Bluetooth Headset H800

Pc, smartphone and tablet headset: easy to connect and switch between devices rich digital stereo sound: laser-tuned speaker drivers, built-in equalizer and noise-cancelling mic for crystal clear calls and music*. sensitivity (microphone)- -47dbv/pa +/- 3db. sensitivity (headphone)- 97db +/-3db 40 ft. wireless range: listen and chat up to 12 m from your pc-or pair with your smartphone or tablet using bluetooth. input impedance: 32 ohms six-hour rechargeable battery