here is an ultra rare item, only other one i saw sold over 1000us on the bay aprx 2yrs ago
item has been tested for power [with a 12vdc 500ma Center Positive Power Supply as per online spec]
although it is meant to be run from a marine/RV battery on site/work location [a modern Li-ion battery would be a much better choice]
it has both course and fine tune adjustments that change the numeric display, the vol/decibel dial also serves as the power switch. [twist click on, attenuation]
an SD card with various webpage info etc can be included at request but it is easily found online. i cannot post the links here as ebay will cry about it!
there are no accessories with this item, the other pic info are from a website.
*shipping there should be no tariff fee to USA as this item was manufactured there!