Lenovo 6550 Dual-Mode Wireless ANC Headset (4XD1S19778) - Capacity: 640 mAh, Connectivity: Bluetooth 5.3 / USB Receiver, Frequency Range: 20 Hz - 20 kHz, Impedance: 32 Ohm, Driver: 40 mm, Battery Charging Time: 2 hours, Cable Length: 1.3m, Play Time: 60 hours, Wireless Operating Distance: up to 30 m, On-Ear Controls