This 5.5 X 2.1mm barrel jack to screw down two conductor connector is a very useful product for LED Lighting， security cabling connection and etc.. projects. You can use this connector to add a barrel connector to a pair of lead wires for connection to a power supply or cable. Please note this adapter is only rated for a maximum of 5A. Features: The 2.1mm DC Plug features a DC 2.1mm plug and connector with mark polarity. No More Cutting and soldering! Connector A : 1 X Barrel Screw Down for "+" & "-" B : 1 X to 2.1mm DC Power Connector Female Package Content (in 1 packet) : 2 X Products in 1 packet