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1) It is the frequency of the Wireless Spy Camera used to send the video signal to the receiver.There are currently 434MHz, 900MHz, 1.2 GHz and 2.4 GHz frequency waves.
Most camarasare great spy 2.4 GHz and is sufficient for all operations of the covert surveillance. Because of the interference,Hidden Cameras, must stay away from 434MHz and 900MHz models.
2) extent of the transfer of the firing line is a measure of the maximum distance the spy cam is the signal from the receiver and even without hindrance and interference between the two received. The offer is usually between 300 meters and 2,000 meters, depending on the model.
3) It is in color or black and white spy cameras. Color Wireless Spy camarasare better distinguish the various elements in the field of vision, but perhaps a little more expensive.
Black and white models usually produce a few high-resolution images are a little cheaper and cheaper than the color groups.
4) Measured in lux. The higher the number, the better the camera sees in low light. Look for a spy camera in low light conditions, go with a unit with a height of 0.05 lux. Pitch Dark opt for covert operations of 0.03 lux.
5) In terms of lines of resolution. The higher the number, the better the image quality. 380 lines resolution is usually sufficient even for professional private investigators.
6) The receiver is what you see a connection to your TV, VCD or DVD on the images and sounds of the Wireless Spy Camera to. If the recipient is not included in the cost of the appliance, ask how much it would cost one, and see if it fits your budget, if additional changes.