They support both wireless Bluetooth connectivity and wired listening through a detachable 1.2m audio cable with a gold-plated L-shaped stereo mini plug. The headphones have an impedance rating of 325 ohms when powered on using a wired connection and 31 ohms when powered off. Frequency response ranges from 7Hz to 20,000Hz during wired operation and 20Hz to 20,000Hz during Bluetooth playback. Sensitivity is rated at 108 dB/mW when powered on and 99 dB/mW when powered off.
Furthermore, the WH-CH720N support Bluetooth 5.2 with an effective wireless range of approximately 10 metres. Sony also includes DSEE (Digital Sound Enhancement Engine) technology for improving compressed audio quality. Moreover, the headphones also feature active noise-cancelling and Ambient Sound Mode, allowing users to hear surrounding sounds without removing the headphones.
When it comes to the battery performance, charging should take approximately 3.5 hours for a full charge. Battery life is rated at up to 35 hours of continuous music playback with noise-cancelling enabled and up to 50 hours with noise-cancelling disabled. Lastly, continuous communication time is rated at up to 35 hours with noise-cancelling enabled and up to 40 hours with noise-cancelling disabled.
