Audio-Technica wireless earphones (wired compatible), black. Color: Black Headphone type: Over-ear Impedance: 36 ohms Noise control: Sound isolation Communication method: Bluetooth standard Ver. 5.0 compliant Supported codecs: AAC, SBC Type: Sealed, dynamic Driver: φ40mm Output sound pressure level: 100dB/mW Usable time: Continuous communication (music playback) Approximately 60 hours *Varies depending on usage conditions. Please purchase only if you understand that this is a used item.