Sony WH-CH720N (WH-CH720N/LCE) is a full-size over-ear wireless headphone with Active Noise Cancellation and NFC support. It has 325 ohm impedance and 108 dB sensitivity for balanced sound performance. Battery life is up to 50 hours with around 3.5 hours charging time. It includes a 250 mAh battery and a built-in microphone for calls.