Smaller then 9 volt size battery the miniature room transmitter could be concealed almost anywhere in a room or an office.   You can hide it in your jackets pocket or place it in your purse or cigarettes pack to record important meeting conversations.

The miniature room transmitter is sensitive enough to pick up even whispers from any part of an average room.

The transmitter is manufactured using new and high reliability hybrid circuits technology.
Frequency operation is around 433 MHz crystal controlled FM narrow band.
Audio bandwidth: 20 Hz to 30 kHz .    No antenna required.
Range up to 700 feet in open area.
The Room Transmitter can operate up to 24 hours with a 9 - volt alkaline battery (not included).

The miniature room transmitter was designed for pros and novice alike - No technical skills needed for installation, No need to program any data into the transmitter.
Just connect it to the 9-volt battery and the transmitter will chose the most clear and available frequency to operate with.
Loud and crystal clear sound of all parties in the room.
Your conversations are protected from accidental reception of regular radio and TV sets in your neighborhood.