Audio surveillance has taken giant leaps forward over the past decades, for example, with the introduction of GSM bugs, which can transmit their intelligence at an unlimited distance thanks to the built-in SIM card that allows, with a simple phone call, to listen in real time to conversations that take place even on the other side of the world.
However, the heart of an operation covert listening is made up of miniature microphones which, at least in appearance, have not changed too much if compared to what we were used to see in old spy movies taking place in countries and times beyond the Iron Curtain.
Obviously, with technological advancement, the characteristics of modern surveillance microphones have dramatically changed for the better now, because we have microphones that are increasingly smaller but much more powerful, able to capture sounds from a distance of a few tens of meters, equipped with noise filters that allow you to cut off background noise, so you can hear very clearly what really a surveillance operation is all about: the human voice.
There are several types of microphones, coming in small size comparable to a cigarette butt, capable of operating in different environmental conditions, and of transmitting their intelligence via radio over a wide frequency range, between 20 and 16000 Hz.
Every police operation or private investigation which requires the use of miniature microphones, has different characteristics and therefore needs a specific type of equipment and microphone.
To guide you in choosing the right hidden microphones to suit your needs, it is important to contact an expert, therefore we recommend that you visit the Endoacustica website, where you will find answers to all your questions in this particular field.