The Mobile Crypto GSM can communicate with every subscriber in the normal unencrypted way. However, by one touch of a key this phone supports end-to-end encryption between two (or more) [...]

This portable and battery operational device (temporary) can be set up at any location (meeting, hotel room, vehicle, etc.).

Handheld digital voice scrambler privacy device. Pivoting acoustic couplers. Accepts virtually all styles of telephone handsets. Works equally well with wired, wireless and (cellular) mobile [...]

The specially designed concrete microphone is provided with a sensitive audio amplifier that enables the user to pick up indoor sounds through doors, windows or walls. Adjustable volume control [...]