Welcome to the world of high-end sound! I am offering the Sennheiser flagship IEM, the "IE900." Enjoy music as it is, with high resolution and natural sound. Operation confirmed MMCX terminals, cables, and housings are all in good condition. No nozzle clogging. Stored in a non-smoking, pet-free environment. The outer box is clean. There is a very small scratch on the top of the earphones, but the photos are taken up close, so it appears more noticeable than it actually is. In reality, it is only visible under strong light and from a close distance, and it does not affect the sound quality or operation in any way. No sound interruption during cable operation. Left and right channels are normal, 20Hz-20kHz, no distortion or noise, and normal phase. DC resistance: L 016.6Ω / R 016.6Ω → No abnormalities. Information Serial: 23634 Manufacturing date: 2023/11/21 Confirmation date: 2025/8/14 Accessories (all new) 3.5mm unbalanced / 2.5mm balanced / 4.4mm balanced cables, genuine carrying case, ear tips (S/M/L), cleaning cloth, outer box, and full instruction manual. ⚠ Note Please refrain from purchasing if you are sensitive to used items. Price negotiations are possible (significant discounts are not). Shipping within 24 hours of payment confirmation. Professionally inspected and anonymously shipped. All accessories and inspection results are shown in the photos. Multiple units available. Search terms: Sennheiser IE900 IE 900 IEM Earphone High-end Balanced cable IE600 IE800S In-ear monitor