Features : 

This item is One Universal 4.5V 1A 4.5W external switching  power adapter.

Solve the problem of insufficient power supply mobile hard  disk.

Wide input range， high precision voltage.

Power supply polarity : Inside positive outside negative，inside x(+) outside i(-).

Input :110~240V AC  50/60HZ

Output : DC 4.5V 1A 

Cable length : 90 cm

DC Plug Dimension : 5.5mm * 2.5mm 

DC Plug polarity : Positive Inside， Negative Outside.

Plug : US/EU Plug

Package Include : 

1 x 4.5V 1A 4.5W Power Adapter

Detail Pictures :