DELL PRO WIRELESS ANC HEADSET WL5024, Tech Specs: Audio (output/speaker): Speaker Size 40mm, Frequency Response 20Hz - 20kHz, Frequency Response (talk mode) 100Hz - 8kHz, Speaker Driver Sensitivity 120dB @ 1mW/1kHz, Noise cancellation Hybrid ANC, User Hearing Protection Yes - EN50332, Audio codecs supported AAC (advanced audio coding), SBC, LC3, Audio (input/microphone), Noise cancellation (microphone) AI Up- Link Noise Cancellation, Microphone Type 5 (2 analog, AI Beamforming & 4 Hybrid ANC), Microphone Frequency Range 100Hz - 14kHz, Microphone Direction Uni-Directional, AI Beam Forming, Sensitivity -45dBV/Pa, Signal-to-Noise Ration (SNR) 55dB, Mic Boom 100-130° rotation (Discreet, single sided, left), Design & Fit: Form Factor On-Ear, Weight: 219g, Ear Cup Size (Diameter) 70 (W) x 77 (H) mm, Headband Material: leatherette + memory foam, Ear Cushion Material: Leatherette + memory foam cushions, Battery & Charging Performance: Fast charging Yes (Plugged). 15 mins = approx 10 hrs (listening, ANC & Busy Light OFF), Charging Mechanism USB- C (Plug in for fast charging), Charging Stand (sold separately), Headset Battery Capacity: 750 mAH, Battery Charge Time 2.5 Hrs to Full, Talk/Listening Time Talk: Up to 34hrs (ANC & busy light off), Up to 20hrs (ANC & Busy light on), Listening time:Up to 78hrs (ANC Off & busy light off), Up to 50hrs (ANC On & Busy light off), Connectivity: Wireless Connections: BT 5.3 w/ range up to 30 m/100 ft, Wireless Adapter (Teams' BT Dongle) Yes, USB-C, Wired Connections Detachable USB C-C (charging), Cable Length 1.5m, USB Converter Adapter/Dongle USB-A (male), USB-C (female), Multi-Point Yes (Up to 8 devices (memory), 2 simultaneous connection), 2 Year Limited Hardware with Advanced Exchange Service