SMSL Audio Silver V2 Audio DAC Amp output power: 32Ω 500mWatTHD=0.01% 64Ω 500mWatTHD=0.006% 150Ω 123mWatTHD=0.003% 300Ω 133mWatTHD=0.003% USB support: Windows, Mac OS, iOS (requires optional connector), Android4.0 above (most models). Total power consumption: <3W Supply voltage: DC9V 500mA Machine dimensions: Length Width 120mm X 92.8mm X 23mm high Packing volume: long width 160mm X 220mm X 44mm high Logistics Weight: 0.55KG