Yealink BH71 Mono Bluetooth Wireless Business Headset System 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. The BH71 also provides an adjustable ear hook for comfortable wearing, and you can pull out the ear hook easily to best fit your ear. Whether you are on-the-go or in the office, BH71 can guarantee 10-hour talk time to secure your all-day use.