Pc, smartphone and tablet headset: easy to connect and switch between devicesrich digital stereo sound: laser-tuned speaker drivers, built-in equalizer and noise-cancelling mic for crystal clear calls and music*40 ft. Wireless range: listen and chat up to 12 m from your pc-or pair with your smartphone or tablet using bluetoothsix-hour rechargeable battery : listen and chat longer with easy usb charging. Frequency response (headset): wideband: 30hz to 15khz, narrowband: 40hz to 3.2khz. Frequency response (microphone): 100hz to 6,500hzpadded comfort: adjustable padded headband and sculpted ear cups for a feel-good fit.