Although it is unused, it has been opened once to check the contents. Thank you. Sealed inner-ear headphones SE-CL722T-R Red Brand: Pioneer Wearing style: Both ears, integrated left and right Headphone type: Canal type Structure: Sealed Color: Red系 (Red-based) Wireless/Wired connection: Wired connection Headphone features: Remote control Low-frequency range (Hz): 5.0 Hz High-frequency range (kHz): 22.0 kHz Impedance (Ω): 16.0 Ω Sound pressure sensitivity (db): 100.0 db Drive method: Dynamic type Plug shape: Mini plug Driver size (mm): 8.0 mm Cord length (m): 1.2 m Weight (g): 9.0 g