HiFi Audiophile Lossless Portable Music Player. he M1s is the second generation product of the popular aune Ml , it adopts an asynchronous clock technology and the latest Cortex-M7 pure hardware solution framework, supporting multiple music formats and DSD hard-ware solution. It is high-end mini high fidelity player with balanced output and continuous playback. It's a portable hi-fi music player with high standards and superb sound quality. Compact Size, Easy to Use. Support multiple high-resolution formats, up to 32Bit 384 KHz. The M1s has a 3.5 mm output jack and a 2.5 mm balanced output jack. It is powerful solution with four impendent internal headphone amplifiers, connecting to headphones with a different effect. The M1s adopts the design utilizing a high quality internal power supply. It inherited the positive and negative power supply and second -level ultra-low-ripple circuit of aune B1-which ensures that the sound produced, is delicate and dynamic. About 11 hours of continuous playback-tested with 16bit/44.1khz WAV files at 70 volume at a continuous playback time, If listening for four hours every day, the M1s can be used for three days on a single charge. The M1s uses 100% aluminum CNC to cut out its chassis, six sides of which are finished by CNC.The surface of it is finished by anodic oxidation and a brushing treatment. The characters on the surface are done by laser. It is sturdy, durable and well-built.