The Roseselsa RS9039 is a compact portable USB DAC/amplifier based on the latest ES9039Q2M chip with an output power of up to 300 MW (4.4mm balance) and 240 MW (3.5mm). It has a warm and rich sound with deep bass, a pleasant middle, smoothed tops and a cozy stage; it is great for music lovers of IEM and headphones, works with PCs and smartphones, has two outputs (3.5 and 4.4 mm) and an aluminum case.