This 1000ma multi voltage regulated switch mode plug in power supply has 7 adjustable output voltages 3, 4.5, 5, 6, 7.5, 9, and 12v and 8 dc plugs ic regulated dc output, short circuit protection and automatic overload cut off. Simply plug the 3 pin plug power supply into a 13 amp mains socket, choose the correct adaptor head, and use the twist dial to choose the correct voltage. Please read the full safety instructions provided with the product. Barrel connectors outer diameter x inner diameter 5.5 x 2.55.5 x 1.55.0 x 2.14.0 x 1.73.5 x 1.352.35 x 0.753.5mm mini jack like a headphones plug2.5mm mini jack smaller than regular headphones plug 180cm black cableh7.6cm x w5cm x d4.6 excluding pinspower supply 100 240voperating current 70maoutput voltages 3, 4.5, 5, 6, 7.5, 9, 12voutput current 1 a