Logitech H800 Bluetooth Wireless Headset

Easy to connect and switch between devices Rich digital stereo sound: Laser-tuned speaker drivers, built-in equalizer Noise-cancelling mic for crystal clear calls and music Sensitivity (microphone)- -47dBV/Pa +/- 3dB Sensitivity (headphone)- 97dB +/-3dB 40 ft. wireless range Input impedance: 32 Ohms Six-hour rechargeable battery Frequency response (Headset): Wideband: 30Hz to 15KHz, Narrowband: 40Hz to 3.2KHz. Frequency response (Microphone): 100Hz to 6,500Hz Padded comfort: Adjustable padded headband and sculpted ear cups for a feel-good fit