Surveillance Transmitters / Room Listening Devices

Electronic surveillance occurs by using many different types of electronic devices. Today in this post I will discuss the common room transmitters. Room transmitters are designed to be placed or installed within a room or an area where conversation occurs. The device is designed to record or allow the installer the ability to listen to those conversations that happen to occur near his device. By near the device I determine that to be about 25 feet more or less. There are room transmitters that can hear a pin drop on a wood floor. Some transmitters are battery powered and some are powered by the local power supply. Some transmitters send the signal to a receiving recording device or to a monitoring station nearby.

Battery powered transmitters are devices that have an internal battery power supply are usually those cheap units that you can buy in a magazine. They usually are short range and not very reliable for those wishing to listen in on your conversations. Battery powered transmitters are installed or made in a wide range of products. Some disguises are;

1. Calculators

2. Clocks

3. Photograph frames

4. Inside door frames

5. Inside clothing

6. Briefcases

7. Wastebaskets

8. Radios

9. Paperweights

10. Wall plugs

11. Extension cords

12. Pens

13. Shredders

Small transmitters used for room listening can be concealed or installed in almost item that can be imagined. This writer conducts counter surveillance sweeps and in the past many years has found transmitters in all type of items. One year, I found numerous listening devices in electronic toys given to children which were usually battery powered to function and would piggy back the power source to transmit the captured sounds. I have located transmitters powered by 9 volt batteries, hearing aid batteries and wired to a source. Battery sources vary and their signal strengths also varies. Transmitters in a pen or a calculator can transmit about 14 to 22 meters. If you find a pen or calculator transmitter look to the receiving recorder with a maximum of 22 meters.

Extra Powered Transmitters

There are also transmitters that are main or local power supplied. These type of transmitters can also be hidden almost anywhere. Current items or locations where they are hidden can be or are.

1. Walls

2. Dividers

3. Ceiling panels

4. Alarm boxes

5. Outlet electrical plugs

6. Office Equipment

7. Wall clocks

8. Table Lamps

9. Radios

10. Televisions

11. Calculators

12. Copiers

13. Shredders

14. Ventilators

15. Ceiling lights

Extra powered transmitters

Extra powered transmitters that are supplied by a main line power supply usually last indefinitely. This units do not require regular replacement of batteries.

Depending upon the device, it is possible for it to obtain as much power as it requires for transmission. If such a device is hidden deep in a wall the counter surveillance detector operator might be afraid to dig out the bug because of damage he may cause.

Important points to remember about Battery powered transmitters the battery life is limited you will need to have repeated access to the device and sooner or later they will catch you replacing its batteries. When using batteries you will have to lower its power usage to permit to last longer periods of time. Any battery powered surveillance device installed or placed in a building must be considered disposable. The collection of information with battery powered devices must be completed within 72 hours to avoid any risks.