Brand new, unused item. Sennheiser Wireless Headphones bluetooth HD 458BT Black x Red Noise Canceling Low Latency AAC aptX-LL Bluetooth 5.0 Multi-point Voice Assistant Integration Smart Control App ・Amazon-exclusive color model of the HD 450BT, which won the VGP Award Gold Prize. ・Sennheiser's renowned natural and effective noise canceling, natural music reproduction that doesn't compromise the quality of voices and 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 response: 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