This item is brand new and unused. Sennheiser Wireless Headphones bluetooth HD 458BT Black x Red Noise Canceling Low Latency AAC aptX-LL Bluetooth 5.0 Multi-point Support Voice Assistant Linkage Smart Control App ・Amazon-exclusive color model of the HD 450BT, which won the VGP Award Gold. ・Sennheiser's renowned natural and effective noise canceling, natural music reproduction that does not impair the quality of voices and musical instruments ・Supported codecs: SBC, AAC, aptX, apt-X LL ・Approximately 30 hours of continuous use with a 2-hour charge. Charging port USB Type C ・Dynamic, closed-back. Certified with the Technical Regulations Compliance Mark. Operating frequency band: 2.4GHz ・Frequency characteristics: 18 Hz to 22,000 Hz (-10 dB) ・Sensitivity: 108 dB (1 kHz/0 dBFS) ・Accessories: USB-C charging cable, audio cable (3.5mm stereo mini plug), carrying case [Product Contents] ・Brand: Sennheiser ・Model name: HD ・Color: Black x Red ・Headphone type: Over-ear ・Connectivity technology: Wireless