It was install and put together. Yes, it didn't come with instructions, but it is just as easy to go on the internet and look up the instruction manual. It is so easy to walk up to it and have your temperature read. We did test it with placing our hand in front of the heater to see if it actually alarms when an individual's temperature is above 100 degrees. And believe me it does. Nice Job!!! Overall we are quite pleased with it, and it has made the job for the bailiff easier as now he has less contract with people entering the courtroom. Thanks for a product well designed.