Sennheiser IE 600 ⸻ Peace of Mind with Professional Inspection This product has undergone professional inspection, confirming that the appearance, functionality, and sound quality are all in top-tier condition. Impedance measurements and channel balance test results are also excellent. You can enjoy the best sound quality immediately after purchase. Product Condition • All accessories have the same serial number (authentic product for peace of mind) • Functionality confirmed, both left and right sides produce sound normally • Disinfected and cleaned with 99.5% ethanol • Stored in a non-smoking, pet-free environment • Overall in good condition with no noticeable scratches, but please consider that this is a used item ⸻ Full Set of Accessories • Outer box • Instruction manual • MMCX cable • 3.5mm unbalanced cable • 4.4mm balanced cable • Various size ear tips (foam/silicone) • Dedicated carrying case ⸻ Exterior Condition • Housing: No scratches, dents, or discoloration • MMCX connectors: No wear • Cables: No breaks, tears, or rust ⸻ Functionality and Sound Quality Check Results • Impedance measurement: R = 16.6Ω / L = 16.6Ω (within specifications, no difference between left and right) • Frequency sweep test (20Hz〜20kHz): No distortion or noise • High frequencies: Clear and not harsh • Mid frequencies: Vocals and instrument sounds are clear • Low frequencies: Stable without muddiness Shipping • Shipping included / Secure anonymous shipping • Carefully packed and shipped within 24 hours Highly recommended for those seeking high-quality sound. For those who don't mind minor scratches, this is an excellent value. Please consider this opportunity.