Dell WL3024 Wireless Headset (520-BBDG) - Speaker Size: 28mm, Frequency Response: 20Hz - 20kHz, Noise cancellation (microphone): AI Up-Link Noise Cancellation, Microphone Type: 2 Uni-Directional, AI Beam Forming, Form Factor: On-Ear, Connectivity: Bluetooth, USB-C (plug in for fast charging), Battery Capacity: 500 mAH, Talk/Listening Time: Up to 41 Hrs