The Smoke/Fire Alarm Notification package with Alarm Clock Receiver and Bed Shaker from Bellman & Symfon is designed to keep you and your family safe day and night. The Smoke Alarm Transmitter is to detect heat and smoke, at the earliest possible stages. When activated, the transmitter will immediately send a radio signal wirelessly to the Alarm Clock Receiver, and you will be alerted with bright flashing lights and intensive vibrations from the bed shaker which will be sure to wake hard of hearing, deaf or heavy sleepers. The backup batteries on the Alarm Clock Receiver can keep it fully functional even during a power outage. This Smoke/Fire Alarm Notification package will especially help people with hearing loss stay safe and feel protected! This complete package has been certified according to standards UL217 / ULcS531.