You can easily screw wires on it without soldering. 【Specification】AC/DC adapter Input: AC 100-240V, 50/60Hz. Output: DC 9V 2A 18W Max. 【Note】polarity of this 9v adapter is Central Positive(+) and Outer Negative(-),But we added a polarity converter cable, which make it compatible with more devices,doubles its range of application.