The yale alarms power switch allows you to turn home appliances on and off remotely ie lamp or radio via the yale smart home alarm app on your smartphone free app download required it is wireless and easy to pair with your yale home alarm system allowing you to extend you system to tailor it to your individual needs uses 868mhz technology this frequency is tightly controlled making it a clearer channel with less interference compatible with yale sr smart home alarm systems 2 year guarantee incl