In general, an IR remote control jammer is a device that produces non-visual (infrared) light “noise” of specific frequency, in order to confuse IR receivers, and thus disable (jam) their remote controls. An IR R-C jammer does not harm any of the devices. You can imagine an IR jammer as a loudspeaker near you (the IR transmitter) and a friend of yours (IR receiver) that is some 10 meters away. If the loudspeaker is loud enough, then your friend will not understand what you are saying.
IR Remote Control Jammer Review – [Link]