OdiySurveil(TM) 20 Pairs Male And Female 2.1x5.5mm Jack DC Power Adapter for CCTV Camera-Black - Simply & Professional appearance for power cabling; - Easier for camera installation, save time and more securer cable connection; - 2.1 x 5.5mm Male power plug connector; - We only guarantee the quality of our OdiySurveil brand, please look for the OdiySurveil(TM) brand to buy(with Overseasymall Package); - Internal diameter of the plug: 2.1mm,External diameter of the plug: 5.5mm.