Perhaps this is only available in the USA, it does need to be able to make a real phone call, not "calling" and I am not sure you can use Echo devices to make real phone calls in the UK. It seems to also mainly work with "ring" devices.
I could find this on the USA site but not the UK one.
17. How does Alexa Guard work?
You can configure supported Echo devices to detect specific sounds you select, such as the sound of smoke and carbon monoxide alarms and glass breaking. Guard will only detect these sounds when set to Away mode. Similar to the wake word, the device detects these sounds by identifying acoustic patterns that match the sounds you select. Guard does not store or send audio to the cloud unless the device detects a selected sound. Alexa can send you a Smart Alert, via a mobile notification, that allows you to listen to detected sounds through your Alexa app. Alexa Guard is not a replacement for an alarm system or life safety device and cannot contact emergency services, such as the police or fire department, on your behalf. However, if you connect a supported professionally monitored security system to Guard, you can choose to forward Smart Alerts, including audio recordings of selected sounds, to your security service provider.
Not a question but an observation. I just tried 7 smoke detectors and CO detector and Alexa only responded to 4 of them. Most were in rooms that Alexa was located. It seems to be something with the tone of the alarm not the volume of the alarm. In 1 room it did not hear the detector but did hear another detector in a different room thru a closed door.
Amazon, this is really frustrating that USA get all the add-ons and here in the UK we don’t get them. Why is this the case. It’s really not fair. I would really like to use Alexa Guard in my house
You're not contacting Amazon by posting here, therefore they won't see your comments nor will they respond. This is a peer-to-peer forum so you're talking to other customers. You can send comments via the Feedback option of the Alexa app or contact Customer Service using the 'Help > Need More Help > Contact Us' link at the bottom of this forum or any Amazon site page.