Features:Wired + Wireless Best Sound Guaranteed - Certified by the Hi-Res audio the Hi-Res Wireless audio, the W820NB Plus's high-frequency bandwidth is up to 40k - Hz. The music is reproduced with high resolution, more details, wider soundstage, and richer emotions. Wired or wireless, enjoy the high quality sound with vitality. - LDAC Audio Codec Feel the Rich Details - The W820NB Plus features LDAC high definition codecs technology, with the transmission bandwidth up to 990kbps, like the highway in wireless protocol. The high bit-rate audio files are greatly protected during wireless transmission, with about 3 times music details retained, offering nearly lossless sound, natural and full. - Fine Tuned Drivers Dynamic and Powerful - The selected 40mm titanium coated composite diaphragm drivers have excellent transient response, greatly improving the resolution of high frequencies. They deliver a thick and dynamic bass rich and transparent mid-treble. The powerful drums, soft vocals and melodious pian