Analogue monitors use an older technology so they are increasingly less common than their digital cousins. Actually there isn’t a great deal on the market these days. They are a cheaper monitor, but are more prone to static and interference from other electrical equipment close by.
Analogue monitors don’t have a particularly long range, but they should be just fine for an average sized home. Also may be worth noting that doors, walls and other structures can interrupt the range.
To cut down on interference, you can check what frequency your cordless phones and Wi-Fi routers run on. The most common frequencies for analogue monitors are 49MHz, 900MHz and 2.4GHz.
Digital monitors use pretty much the same functions as their analogue cousins but because of their digital nature they have a clearer signal and pick up less interference but can still have fun with your wireless routers!
Due to their superior performance in pretty much everyway they are more expensive than the analogue versions but not as bad as you might think as technology has become more readily available in recent years.
DECT (Digital-Enhanced Cordless Telecommunication) baby monitors, now these bad boys really are up to date. Technology wise they virtually have no interference at all due to the secure signal and a far superior range than analogue. DECT is highly popular and often used in specific portable units such as mobile phones, cordless home or business phones and of course digital baby monitors.