A Brand-New Processor That Surpasses Competing Products — Qualcomm Snapdragon 680 Built on a 6nm process it delivers superior performance and enhanced power efficiency. With 4GB+64GB storage and Android 13 it ensures smooth and seamless operation for all major music apps. Patented Desktop Mode with 950mW High Power Output: When Desktop Mode is activated the M21 operates entirely on external power with the built-in battery neither charging nor discharging—effectively extending battery lifespan. Quad CS43198 Matrix DACs Fully Balanced 2-Stage Amplification: Featuring a 4-channel 8-path fully differential output design it unleashes its full potential with exceptional dynamic range and high noise immunity. The headphone amp adopts a 2-stage circuit design—the first stage handles voltage amplification while the second stage boosts current—ensuring pristine sound quality and rich detail. Versatile Ports High-Performance Output: Supports dual 3.5mm + 4.4mm headphone/LO outputs equipped with independent line amplification circuits. Also supports SPDIF and USB Audio output with SPDIF performance rivaling professional digital transports—reducing jitter by 70%. -