Medical-Grade High-Transparency PC Material with Aluminum Alloy Cavity TANCHJIM ONE is crafted with Medical-Grade High-Transparency PC Material and an Aluminum Alloy Cavity. The high-transparency shell combined with the aluminum alloy rear cavity enhances the overall aesthetics of the product, giving it a minimalist, fresh, and compact appearance. Flagship Dynamic Driver Unit Featuring a combination of metal ball-tops and PU & PEEK composite material for the diaphragm, the earphones achieve a wider dynamic range and significantly reduce distortion, resulting in more solid imaging and positioning. Every piece of music is presented like a captivating story, creating an immersive audio. High-Performance Audio Decoder for DSP Tuning TANCHJIM has optimized the professional tuning with consideration for market preferences. The ONE-DSP version utilizes a high-performance audio decoder for DSP tuning, featuring a smooth perception of the extreme high frequencies, well-controlled midrange, and enhanced low-frequency extension, all in line with TANCHJIM's target frequency response curve. Ergonomic Wearing Design Angled Straight-In Wearing Style, Coupled with Angled Sound Outlet, Ergonomic Design, and Precision Ear Canal Fit for Easy Plug-and-Play Convenience; while the Over-the-Ear Wearing Style is more suitable for audiophiles' wearing habits, with an ergonomic design that precisely matches the contour of the ear. The comfortable listening experience is beyond words. Specification Brand: TANCHJIM Model: ONE Driver: 10mm dynamic driver Dynamic technology: DMT 4 Dynamic diaphragm material: Peek&Pu Suspended Ti Diaphragm bulb top THD: Impedance: 160±10%@1kHz Sensitivity: 126dB/Vrms@1kHz Frequency response range: 7-45kHz Wire specification: 1.25m (3.5mm plug - 0.78PIN/Type-C plug 0.78PIN) Cable material and structure: Litz single crystal copper silver-plating + Litz oxygen-free copper composite mixed Coaxial structure