Direct current - recommended voltage: DC 0-36V; Recommended current: less than 3A DC supply voltage: 0-36 V; Current: 3A max Package contents: 4 x 1m extension cables with 2.1mm x 5.5mm DC connectors. hint: Plug Dimensions - These cables only work with devices with 2.1mm x 5.5mm DC male jack. Please check the plug size of your device. Make sure the inner diameter of the DC male jack is 2.1mm and the outer diameter of the DC male jack is 5.5mm. Plug Dimensions: 2.1mm x 5.5mm. These cables only work with 2.1mm x 5.5mm DC jacks, not other DC jack sizes. Application: Typically used for LED strips, CCTV cameras, security DVR, automobiles, boats, monitors, printers, probes, etc. For CCTV cameras - please check the DC jack size is 2.1mm x 5.5 mm. Good quality product