Wireless Alert Solutions were selected by Royal Mail as their preferred solution for a fire alarm warning device for Deaf people after exhaustive analysis. DeafWatch™ was commissioned over 20 sites including some enormous regional redistribution hubs in Manchester, Sheffield and Swindon. In each case we achieved complete coverage with a single transmitter. We work with the Royal Mail FM management to ensure that regular testing is completed. We also enabled the relocation of a system to a new site.