Noise cancellation, powered by HD Noise Cancelling Processor QN1. Sound quality - these Bluetooth headphones support ideal Resolution Audio, and even compressed music files are upscaled using evolved DSEE Extreme technology. Speak-to-Chat automatically pauses playback when one start a conversation, Wearing Detection powers off headphones when not wearing them, plus more smart features for a seamless, hands-free listening experience. With multipoint connection, Sony headphones can be paired with two Bluetooth devices at the same time, Bluetooth version: 5.0 and frequency range: 2.4GHz band (2.4000GHz-2.4835GHz), Effective Range : Line of sight approx.30ft (10m). Driver Unit : 40mm dome type (CCAW Voice coil), Plug : Gold-plated L-shaped stereo mini plug, Cord Length : Headphone cable (approx. 1.2m, OFC strands, gold-plated stereo mini plug).