Refurbishing old alarms

Does your alarm look dated and worn out? some parts discolored with age and is it becoming hard to work out whats wrong when it has had a fault or a false alarm?
There are so many improvements with technology now that as well as looking more stylish there are more features and options available to suit your requirements, they can now do so much more than just ring outside when activated.
New smart systems can be set/unset via an app on your smart phone and can also sent you alerts on activation.
Installation has never been easier now with many models not requiring wiring to be run but using batteries.