Black Office/Call center Ear-hook Headset Wireless USB connectivity Bluetooth Supraaural 150 - 6800 Hz 3293 dB Microphone type: Boom -34 dB Built-in battery One mono replacement headset for Jabra Jabra Pro 9400 Series. Performance DECT connectable Yes Product colour Black Headset type Monaural Recommended usage Office/Call center Wearing style Ear-hook Product type Headset Ports & interfaces Bluetooth Yes USB connector Micro-USB USB connectivity Yes Connectivity technology Wireless Headphones Headphone sensitivity 93 dB Impedance 32Headphone frequency 150 - 6800 Hz Ear coupling Supraaural Microphone Microphone noise-canceling Yes Microphone direction type Unidirectional Microphone sensitivity -34 dB Microphone frequency 150 - 6800 Hz Microphone type Boom Base station Base station weight 197 g Base station dimensions (W x D x H) 94 x 160 x 82 mm Battery Standby time 38 h Battery voltage 7.5 V Battery recharge time 2 h Talk time 10 h Rechargeable battery Yes Battery type Built-in b