The QUESTYLE M15C DAC/AMP is a Cirrus Logic CS43198 flagship portable USB DAC/headphone amplifier that unlocks PCM 384kHz/32-bit + DSD256 hi-res lossless audio from codec-limited smartphones, tablets, laptops, and PCs. Its ultra-compact CNC anodized silver aluminum design (61.9x27.9x12mm) disappears into daily use while delivering patented 4x CMA SiP modules with 0.00028% THD+N, 1MHz bandwidth, and 42.79mW@300Ω balanced power—eliminating distortion, overheating, and battery drain even during extended hi-fi sessions. Plug-and-play across iOS, HarmonyOS, Android 5.1+, Mac, and Windows 10+ with no drivers needed, featuring 3.5mm/4.4mm dual outputs, manual gain control, and a smart LED sampling display for effortless optimization with sensitive IEMs, planars, and demanding headphones. The premium silver finish with TOREX power management and included USB-C cables protects the circuitry through travel and commutes, transforming any smart device into a serious hi-fi audio transport.