This is the Astrotec AM850 MK2. It is a brand new, unopened item. I purchased it but haven't used it, so it's a shame. I hope someone will use it. Please note that due to work commitments, there may be delays in communication and shipping. Thank you. - Brand: Astrotec - Model Name: AM850 MK2 - Features: LCP Material Diaphragm In-Ear Monitors Low Frequency Response (Hz): 5.0 Hz High Frequency Response (kHz): 35.0 kHz Impedance (Ω): 32.0 Ω Sensitivity (dB): 106.0 dB Driver Type: Dynamic Plug Type: Mini Plug Driver Size (mm): 10.0 mm Cable Length (m): 1.2 m