Yealink BH71 Bluetooth Wireless In-Ear Headset, Wireless Charging box, USB Bluetooth Dongle. Provides a high-definition audio quality no matter in the car, on the train or in the office whether connect to your smartphone, desk phone or PC. With the 4-mic beamforming noise cancellation technology, you can always be heard clearly. Features: Designed for: Hybrid Worker Noise cancellation: 4-Mic Beamforming noise cancellation Adjustable ear hook: Yes Talk time: Up to 10 hours Weight: 18 grams Connectivity: Mobile/PC Wireless Range: Up to 130ft/40m (In Ideal Conditions) BT51: Yes Portable Case: Charging case(20 battery life)