... a-Led Bulb 12V 1W*2 b-5m wire for system*1 c-lamp_socket with 3m wire*1 ... Adjustable) Output current 500MA for USB; 3A for DC Output interface 3 (1 for USB, 2 for DC) For USB,Output voltage :5V ... Output current:500MA For DC, Output voltage:12V ... System Application: DC lamp (12V) ,camera, mobile phone ,MP3,MP4,MP5,GPS,PDA,video and so on.