3V 1A Adapter DC connector

Features : This item is One Universal 3V 1A 3W 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 : AC 110V~220V, 50/60 HZ.(Please make sure the input voltage is in the range, or it will be blown.) Output : DC 3V, 1000mA. (Recommend the use of current is less than 1A, otherwise easily damaged) Cable length : 40 cm DC Plug Dimension : 5.5mm * 2.5mm DC Plug polarity : Positive Inside, Negative Outside.