High-Performance Chip: The full, uncut desktop ES9038PRO DAC chip with eight independent D and A converters is employed in the M15S Desktop Mode: When in the dedicated desktop mode and under USB fast charging, the M15S will transform essentially into a desktop device and work completely without the battery Ideal Audio Player: With the implementation of the dual power supply modes onto the M15 with its more ergonomic design, the M15S is the ideal combination of portability and high performance