This ordinary looking calculator is no jovial matter. It is a highly sophisticated audio transmitter which can pick up even the faintest of sounds. The device does not need external power and is very easy to use.

This very stylish looking calculator is actually a surveillance microphone in disguise. Although it is extremely small and does function like a regular calculator, it also catches and relays sounds from its nearby regions with high fidelity.

This is the world's lightest and smallest wireless digital transmitter in its class. Powered by a regular cellphone battery, this powerful transmitter offers reliability of transmission and high quality feedback.

This device is a digital transmitter par excellence. The thinnest in its class, it is easy to operate and gives a high quality audio. Extreme reliability of transmission and a good rechargeable battery life are some of its added advantages.

This is a UHF transmitter which is small in size and can be easily concealed. It offers long battery life, good audio, amplification control and can transmit over 200m away in open field.

This is a telephone transmitter which can also function as a surveillance transmitter. It will transmit telephone calls when in use. When there is no call, it will act as a conventional surveillance microphone and it does not require external power.