Graphite Calls/Music Head-band Headset Wireless Bluetooth 5.2 30 m Circumaural 45118 dB Microphone type: Boom Built-in battery Lithium-Ion (Li-Ion) Performance Optimized for Unified communications (UC) Number of simultaneously connected devices (max) 8 Number of paired devices remembered 2 BeamForming Yes Cable length 1.5 m Control type Buttons Control unit type On-ear control unit Volume control Button Operating keys Answer/end call, Play/Pause, Reject call, Volume +, Volume - Product colour Graphite Headset type Binaural Recommended usage Calls/Music Wearing style Head-band Product type Headset Ports & interfaces Wireless range 30 m Frequency response (talk mode) 100 - 8000 Hz Frequency response (music mode) 20 - 20000 Hz Bluetooth version 5.2 Bluetooth Yes Connectivity technology Wireless Headphones Driver unit 4 cm Headphone sensitivity 118 dB Impedance 45Ear coupling Circumaural Microphone Microphone mute Yes Number of microphones 2 MEMS (Micro-Electro-Mechanical System) mic