Specification: Voltage: AC250 V Plug diameter: 5.5mm outer, inner 2.1 mm Connector type: 5.5*2.1mm Material (external): PVC+plastic Feature: Simplyprofessional appearance for cabling Easier for CCTV camera installation save time & money Used for any 2.1mm male DC power adaptor Package included:1* one female to four male connector with switch