Need a 12v/3A regulated supply that works all the time, even when the electricity goes out or a 12v gell cell(lead acid) charger. Features: Can be used as a portable supply for all you RC enthusiasts, or makes an excellent supply for the IR Illuminator, or the geophone. Perfect for Beacon or Echolink backup. What about a QRP power supply? Battery back-up for any 12v application. 2.1mm plug, center positive. Front panel illumination to always give you the status of the unit. "Warning speaker" on/off switch. 12v gell cell(lead acid) charger which can remain plugged in indefinitely. Battery test. Automatically conducts a self-test every 21 days. Comes with a 12v/7Ah gell cell(lead acid) battery. . Units are completely checked out and in like new condition. Measures 7-3/4"x7-3/4"x3-1/2". With the battery , the unit weighs 7 lbs.