Generally there are two types of remote controls
Now most of the home entertainment components such as stereos, television and home entertainment centers use infrared remote controls. This remote contains an interior circuit board, processor, and one or two Light Emitting Diodes.
When you push a button on a remote control, it transmits a corresponding code to the receipt of device by way of LED infrared pulses. So the basic idea is somewhat similar to flashing an SOS signal, but instead of letters, the flashing LED light. A receiver, built into the component, receives the pulses of light and a processor decodes the flashes into the digital bits necessary to activate the job.
So along with the desired function remote controls must also take credit with other data. Firstly these industrial wireless remote controls transmit the code for the device they are controlling. The industrial remote receiver knows that the signals it is picking up are intended for it. It essentially tells the component to start listening.
These remote controls can be very finicky requiring the user point the remote directly at the component. This is due to a weak transmitter. Changing the batteries can help, but if the transmitter itself is poor, pulses are transmitted in a narrow beam.
Often it happens that a recliner or favorite spot on the couch doesn't have a clear line-of-sight to the entertainment center or television. A coffee table or some other object is in the way. When this happens we find ourselves raising an arm, trying to control the object 'around' the device. This can get quite annoying, but there's an easy alternative. Since light bounces off objects it is sometimes more suitable to point an industrial remote control towards a flanking wall or even the ceiling to change a channel or send a function command. The light will bounce off the exterior of the wall or ceiling and scatter. If you bounce it at an advantageous angle, the scattering light will reach the component. This can work quite well, even though the remote is pointing in the exact opposite direction of the component.