Listening devices come in many sizes and shapes, and can be disguised as a variety of things, while others do not need to be hidden and are great for purposes other than covert operations. For example, there are listening devices that are perfect for use with a voice recorder or camcorder. Yes, they can used discretely and are so sensitive that they can pick up voices from across the room.
There are even some listening devices that look like ball point pens that can pick up frequency responses from twenty HZ to twenty KHz and that have both ultra-high sensitive and low vibration sensitivity. These listening devices are particularly good for covert operations.
If you need listening devices that are nearly undetectable, there is one microphone and high gain super mini preamp that is the tiniest in the world, and weighs less than one half ounce. How is that for covert? Then there are listening devices that can be placed against virtually any surface, and it will amplify any sound vibration up to one hundred times. These super sensors can be mounted to any surface using acoustical putty that can be reused time after time.
With a personal sound amplifying...
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