This listing is for 12v DC 3.0 ampere power supply UL approved adapter WA-3612AU manufactured by Asian Power Devices, Inc.  It works with many wireless/wired router and modems with 12V input & up to 3A current, Barrel size 2.1x5.5mm. Can be used for TiVo Linksys/Netgear/Belkin/Asus/Buffalo and Obihai VOIP devices (Obi100, obi 110, obi200, obi202 , obi300 and obi302). It also work with many external HDD storage systems with 12V input and up to 3A current. It also an be used for LED light strip lights or other 12 v DC loads up to 36 watt.  It supply a stabilized 12v DC up to 3A (3000 ma) using energy efficient switching PWR (Pulse Width Regulation); It can be used for up to 16.4 ft of LED strip, up to 36 watt 12v light bulb or brush-less fan. It is plug in type, UL listed, approximate outside dimensions (HxWxD) are: 3.25x2x2", cord is 5 to 6 ft long.  Product appearance as shown on picture.