The other option is to buy a wireless doorbell that calls your smartphone – then you'll know there's someone at the door wherever you are.

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Doorbells fitted with video surveillance almost certainly require a low-voltage feed that connects to your household supply. All manufacturers quote a range for their devices. With cheap wireless doorbells this can be as little as 24 to 30 metres. On premium models it can be 90 to 180 metres. Some offer even more range. Multiple receivers allow you coverage over a much greater area. Definitely a consideration if you have a large house.Batteries will always go flat at the most inconvenient time. Even rechargeables will be a couple of hours until you can use them again, so keep a spare set somewhere handy. Technically-speaking, a wireless doorbell is an RF (Radio Frequency) device. When pressed, the button unit sends a signal to one or more receivers, which then play a sound. The frequencies used are strictly controlled by the federal regulatons, so that your doorbell doesn't interfere with police, ambulance, fire, or other emergency services. Usually wireless doorbells operate in the 300 MHz to 500 MHz bands. While the aesthetics of each wireless doorbell are important to you, finding something that looks good with your decor won't be a problem. There are literally thousands of style and colour combinations available. There’s such an enormous range of styles and colours available, there's bound to be a wireless doorbell to match your décor. What is a wireless doorbell?

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An illuminated bell push is useful if you're approaching the door in the dark. Some have motion sensors, so it's possible to turn on an external light. That's good for you when approaching the house, and also good if you're inside – so you can see who's calling late at night. Cheap wireless doorbells might only offer a single bell push and one receiver, but many more options are available, so you can tailor the system to your needs. What can be confusing is the functionality. To clarify things we're looking at the following areas: Most run on batteries. Unless otherwise recommended by the manufacturer, we suggest lithium rechargeables. They're more expensive initially, but last much longer and recharge faster.Should you need to do that, it's important to change both doorbell and the receivers, so they still “talk” to each other. Video monitors can be attached. The most basic of these show you who's calling. Advanced models record the video and will save it securely to cloud storage.