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Baby Monitors

A typical baby monitor, also known as a baby alarm, is a radio system used to remotely listen to sounds made by an infant. The transmitter, equipped with a microphone, is placed near to the child and the receiver equipped with a speaker, is carried by, or near to, the person caring for the infant. Some baby monitors are bi-directional, using transceivers that allow the caregiver to speak back to the baby (parent talk-back). Some allow music to be played to the child.

Baby video monitors (baby cams)
Some baby monitors also use a video camera to show pictures on the receiver, either by plugging the receiver into a television or by including a portable LCD screen. These are often called baby cams. Some baby video monitors can work at night with low light level. Most babu video monitors today have night vision feature. Infrared LEDs attached on the front side of its camera allow a user to see the baby in a dark room. Baby video monitors that have night vision mode will switch to this mode automatically in the dark.

Wired and wireless
Baby monitor generally use wireless systems, but can also use wires or may operate over existing household wiring such as X10). Wireless systems use radio frequencies that are designated by governments for unlicensed use. For example, in North America frequencies near 49 MHz, 902 MHz or 2.4 GHz are available. While these frequencies are not assigned to powerful television or radio broadcasting transmitters, interference from other wireless devices such as cordless telephones, wireless toys, computer wireless networks, RADAR, and microwave ovens is possible. Digital audio wireless systems using DECT, are resistant to interference and have a range up to 300 m.

Analog audio transmissions can be picked up at a distance from the home by a scanner receiver or other baby monitor receivers, and so present a risk to privacy as long as the transmitter is switched on. Digital transmission such as Frequency-hopping spread spectrum provides a level of protection from casual interception.
 

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