Lenovo W770 User Manual

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W770 Wireless Headset User Manual― 6 ―X. PRODUCT PaRameTeRheadset:Drive unit ............................................................................................................... 2 x 40 mmFrequency response ........................................................................................20Hz ~ 20KHzImpedance ................................................................................................ 32Ω±15% @ 1kHzSensitivity (SPL) ...............................................................................103±3dB/1mW @ 1KHzSignal to noise ratio ........................................................................................................65dBWorking voltage ...............................................................................................................3.7VWorking current .............................................................................................................55mABattery capacity .........................................................................................................380mAhContinuous working time ................................................................................................... 6HCharging time ................................................................................................................. 2.5HInput power ...................................................................................................................20mWMaximum input power ..................................................................................................45mWNet weight of headset ..................................................................................................... 160gNet weight of USB Dongle .................................................................................................. 6gmicrophone:Frequency response ...................................................................................... 100Hz ~ 10kHzImpedance ..............................................................................................2.2kΩ±10% @ 1kHzSensitivity ................................................................................ -38±2dB @ 1kHz 0dB=1V/PASignal to noise ratio ........................................................................................................55dBUSB Dongle specification:Working voltage ..................................................................................................................5VWorking current .............................................................................................................55mATransmitting power ......................................................................................................+4dBMTransmitting range ........................................................................................................... 10MModulation mode .......................................................................................................... GFSKFrequency range ................................................................................. 2404MHz ~ 2476MHzInterface...........................................................................................................................USB

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