This is a new release from qdc. I purchased it from Bic Camera Online shortly after the release date. I used it for about 15 minutes after opening it, but it wasn't to my liking, so I'm selling it. I used different ear tips from my own collection, so all the included accessories are unused. Universal IEM FRONTIER QDC-FRONTIER-AQ Aquamarine Brand: qdc Wearing style: Both ears, integrated left and right Headphone type: Canal type, ear hook, clip type Construction: Sealed Color: Blue系 (Blue-based) Wireless/Wired connection: Wired connection Headphone features: Re-cable Low-frequency response (Hz): 10.0 Hz High-frequency response (kHz): 30.0 kHz Impedance (Ω): 52.0 Ω Sensitivity (db): 106.0 db Driver type: Balanced armature, BA type Plug shape: Mini plug Cord length (m): 1.2 m