Fosi Audio DS2 Mini Audio USB DAC Dongle Headphone Amplifier DSD Decoder Amp Support 32bit/384kHz with 3.5MM & 4.4MM Balanced

During extended use, the device performs reliably. Several buyers note that it significantly increases battery drain on mobile phones, which is expected given the amplification. Some users experienced occasional sound dropouts or mono playback issues with TRRS cables, though this may be related to specific cable compatibility. The body becomes slightly warm during longer listening sessions but remains within normal range. Connection quality is stable without interference.

Main complaints concern the included USB-C cable, which several describe as fragile and poor quality — replacement is recommended. The small volume buttons are difficult to operate for some. A small portion of reviews (2.3%) are critical — some buyers expected a larger sound quality difference compared to cheaper alternatives or were unaware the device has no built-in battery. The sound is slightly muffled compared to direct output according to some, though this may be a matter of settings.