range: 50m/164ft#3: Bluetooth® Dongle: BT51 dongle with USB-A or USB-C variant#4: Simultaneous Bluetooth connections: 2#5: Multiple device pairing: Up to 8 devices

#1: BlackAudio#1: Microphone: 3 Mics MEMS#2: Microphone sensitivity: -14 dBFS/Pa#3: Microphone frequency range: 100Hz-8kHz#4: Acoustic Shield: √#5: Active Noise Cancellation: X#6: Speaker: @ 35mm#7: Speaker sensitivity: 117 dB @1 mW-1kHz#8: Speaker max input power: 30 mW#9: Speaker frequency response: 20Hz-20kHz

#1: Music time : Up to 43 hrs#2: Talk time: Up to 35 hrs (with busylight off) / Up to 28 hrs (with busylight on)#3: Charging time: Up to 90min#4: Standby time: Up to 22 daysFeature#1: Dual Busylight on Headset (Dual:both side)#2: Mic-boom Sliding for Mute/Answer#3: Ear Cushions Easily ReplaceableFunction Keys#1: Power/BT button#2: Call control button#3: Volume + button#4: Volume - button#5: Mute button#6: Teams button#7:  Play/Pause buttonManagement#1: Yealink USB Connect (PC)#2: Yealink Connect APP (Android, iOS)#3: Yealink Device Management PlatformPackage Contents#1: Headset#2: Drawstring Bag#3: TypeC to A 2.0 Cable#4: Quick Start Guide#5: BT51 Dongle#6: BHC70 Charging Stand (Optional)#7: Replacement Ear Cushions (Optional)Packing#1: BH70 Mono/BH70 Dual#2: Giftbox Size(mm): 177 x 207 x 53mm#3: Carton Meas(mm): 550 x 185 x 220mm#4: Headset weight: Stereo 147g/5.19oz Mono 91g/3.2oz

#1: 1 years