HDView 12V DC 2A Power Adapter Supply UL Listed Certified 2.1mm 5.5mm, 2a Power Transformer for Security Camera, Best Quality Input Voltage: 100v-120v 12v 2.5a or 12v 2000ma, UL Listed Certified Tips hole size:5.5*2.1 power adaper for router ,switch ,CCTV CAMERA ,networking HUB,12v MP3,MP4,Electric toys, Router, Etc Compitale with 12v 500ma(0.5a) 12v 750ma(0.75a)