Headset Bluetooth version V5.0 Range 10M Music Time 45 hours Talk time 25 hours Driver Impedance 32Ω ± 15% Driver Sensitivity 125 dB ± 3 dB Driver frequency response 20 Hz ~ 20 kHz Mic sensitivity -25 dB ± 1 dB Mic frequency response 100 Hz ~ 10 kHz Ergonomic design The EKSA office headset features an adjustable headband to suit any head shape and prevent slipping. Bluetooth 5.0 Connectivity Bluetooth headset features a built-in Qualcomm chip that provides zero transmission delay and an ultra-stable connection! Breathable Earcups Speak with comfort for as long as you need when using this phone headset featuring soft leather ear pads which are breathable and sweat-absorbent. 45 Hours of Working Time Enjoy up to 25 hours of uninterrupted talk and 45 hours of continuous music playback, thanks to the large rechargeable battery on this work headset.