Using multiple channels and frequencies, up to 12 wireless cameras may be wireless in a multi-camera wireless system. In most cases each camera needs it's own transmitter and receiver.
 

Ranges vary by system and are rated based on unobstructed line of sight. Average ranges are from 100 to 700 feet, and we even have transmitters rated up to 10 miles for civilian use.
 

More powerful transmitters are available for law-enforcement and military. Call for more information.
 

The wireless signal will transmit through walls, ceilings, and other obstacles but any obstructions may decrease the distance. The more dense the material the more the range is reduced.
 

If too many obstacles create poor reception, this problem can often be solved by using external high-gain antennas (on some receiver models).