This is an external DC linear power supply converter box/DC adapter. Its regulator chip is LM317. The transformer is 10W Bingzi sealed toroidal transformer. Its linear circuit design offers low noise output, offers pure power supply environment. It is specialized and suitable for multiple HIFI stereo audio devices, such as DAC, digital players, USB interface, set-up box etc. Help to upgrade their performance. Small size, suitable for use on desktop in HiFi home audio. Input: AC 110V Outputs: DC 5V (DC5.5/2.1 mm) Total max 1.5A current Note: Please choose the correct input and output voltage and current requirement for your device. The wrong voltage will damage. And it is warm during working, which is normal for a linear supply, so please place it in the right place and do not cover it with things around it. Basic hifi experience required. Max Power: 10W Item size: 105*80*45mm Net weight: 0.47 Kg Packing list: 1 unit of linear power supply 1 peice of 5.5/2.1 mm wire 1 peice of input cable