Unlike the baby monitors off the shelf, professionally installed ones usually make use of high end gadgets in watching over your baby. The Types of Baby Monitors Basically there are two types of baby monitors: audio and video baby monitors. Audio baby monitors only make use of sounds while video baby monitors make use of a camera and transmitter to send video feeds to a LCD receiver. If you prefer to have one radio transmitter in every room, there are actually a smaller number of choices. In order to set up a multi-room monitoring system, some parents purchase more than one baby monitors. By simply positioning one radio transmitter in each room, you can listen to the sounds coming from your baby's room even if you're busy with house chores or other stuff. This feature allows parents to carry the device around without much effort. If you intend to take the receiver anywhere in the house for extended periods of time, test out the attachment method just to be sure that it's durable enough to endure daily usage. In addition, you also need to check the battery life and power source. This type comes in both analog as well as digital models. The analog monitors are the most affordable but are usually still reliable. They work through the radio frequency and use FM signals to transmit the sound. The major set-back of this variety is the tendency of other receivers picking up the same signal that your monitor transmits, thus less privacy and disturbances are possible. Even if the lights in the baby s room are switched off, with the help of the night vision baby monitors, you can easily see your baby. They will work perfectly well in low light environment and even in total darkness. Since babies are still quite photo or light sensitive, switching off the lights will greatly benefit them. For that reason, it is better to purchase one that features a channel adjustment capability. This way, you can change frequency bands every time you encounter interference problems. Of course, you also need to factor in the cost of buying a baby monitor. The high-end versions can cost as much as $300 dollars or more.