1. Please check you orinigal power must be 5V and Internal positive and external negative.
  2. Input: USB type-A DC 5V power.
  3. Output: DC 5V 5.5x2.5mm 5.5x2.1mm 4.0x1.7mm 3.5x1.3mm
  4. The input and output power must be same volt, if your input 12v and output 5v, it will be demaged your device.
  5. Adopted 22AWG pure copper cord as conductor. Cable length 150cm.