It's a speaker system owned by the European Space Agency and which is used to subject spacecraft to the pressure and vibration of a real launch.
But it can do more than shake out loose nuts or bolts, it could kill a person. From European Space Agency Has A Sound System That Can Kill You Easily:
When nitrogen is pumped through the horn, it is capable of producing sound over 154 decibels. The resulting sound is similar to standing close to several jets as they take off and is more than enough to permanently deafen someone. Sounds this loud can be harmful to humans and have been used in lower intensities to control crowds, as burglar-deterrents and in the battlefield. Sound grenades produce sound levels between 120 and 190 decibels and are enough to take a person’s life. A recent German research found that sounds up to 210 decibels loud could permanently damage internal organs.
We've all heard music blaring from a car at a red light and wondered how the occupants survived. It probably wasn't loud enough to do damage to anything other than eardrums. But suppose one of those car hackers came up with a way to turn up the volume remotely. Wouldn't that be devious? Well yes, but most of us would probably use it to turn the volume down.