The law in Scotland has changed and as of 1 February 2022 every home now needs to have interlinked fire alarms. So you should check your alarm if they complies with the standards - Carbon monoxide detectors: British Kitemark EN 50291-1

There are 2 types of interlinked fire alarms that meet the new rules:

sealed battery alarms – which should be tamper-proof long-life (which can be up to 10 years) batteries. You can fit these alarms yourself.

mains-wired alarms - these are cheaper than tamper proof long-life battery alarms, but should be installed by a qualified electrician. These should be replaced every 10 years.

Both types of alarm are interlinked by radio frequency without the need for WiFi.

If the carbon monoxide alarm is battery operated, it must have a sealed battery for the duration of its lifespan, which may be up to 10 years. 

Carbon monoxide alarms will be mandatory in UK

According to The Smoke and Carbon Monoxide Alarm (England) Regulations 2015, landlords in England are required by law to “provide a carbon monoxide detector (CO alarms) in any room used as living accommodation where solid fuel is used .that means housing providers are required by law to install smoke alarms in all social housing, and carbon monoxide alarms must be fitted in social and private rented properties with fixed appliances such as gas boilers or fires.

Yes, it's a law that says you have to replace alarms that comply with Scottish legislation. Otherwise you have more to lose.

There are property issues involved. If you have a house fire and your home insurance company finds that you are not complying with the new law, then they may refuse to pay. 

 Built-in 10 years Sealed lithium battery, The whole unit will need to be replaced in 10 years. 

WOLF SHIELD pack comes with two wall screws and screw plugs,the unit an be mounted on the wall, After installing the bottom plate, you can use it directly when you put the product on it. Will I need an electrician to install my new alarms?

A typical alarm for Scotland costs around £30-50, The prices vary depending on the features of the device