We are not sure how this works exactly but we were assured by the person who donated it that it works well and we have tested it for electrical safety.
BELLMAN & SYMFON BED SHAKER BE1272 & FLASH RECEIVER BE1441
Bellman & Symfon Unitron Home Smart Alert System Safety Awareness 868
Bellman & Symfon BE1260 -BE1470
Bellman & Symfon Flash Receiver
Bellman Symfon domino pro listening system with earphones, INCOMPLETE
