Wireless security cameras are used in closed-circuit television systems (CCTV) for surveillance and monitoring. They transmit a video and audio signal to a remote receiver using radio frequencies. Most of these cameras do require wired power, although some models may use batteries or even solar power.

Analog wireless security cameras

Analog wireless cameras transmit their signal in the lower, radio frequencies of 900MHz, 2.4GHz and 5.8 GHz. Note that most of them operate over the 2.4 GHz band, the same band that a lot of household wireless appliances, such as cordless phones and video game controllers, operate on. Interference may result when using in the home.

The advantages of analog wireless security systems is they are lower cost than their digital brethren, and you can use multiple receivers.

The disadvantages are they may cause interference with other devices in the home. The transmission is not secure. the video signal quality is lower than digital, and any interference makes it worse.

900 MHz systems can be used in installations where the signal must go through drywall or even trees to reach the receiver. There is also not a lot of interference with other devices. Unfortunately there are only two channels available at 900 MHz.