Easy to connect the power cord: This kit contains 10 DC plugs and 10 DC plugs, you can connect the open wires together. Wiring Simple and professional electrical wiring. Installation is easier, saves you time and more secure cable connections. Plug and play, no connectors, no crimping. Diameter Inside diameter: 2.1mm, outer diameter: 5.5 mm. Field of application: Applicable to CCTV DVR security camera and LED light bar. (The store has more supporting products, if necessary, please click to enter the purchase) / Specifications: Size: Inner Diameter: 2.1mm Outside Diameter: 5.5mm Weight: 14 grams Color: Silver+Green+Black Package Include: Male Connector X 10Pcs Female Connector X 10Pcs Note: The current should not exceed 2 amps. Pay attention to the polarity when connecting the plug and mark the positive and negative terminals on the terminal.