Mersound designs and installs voice evacuation alarm systems and holds SBSC certification as anläggarfirma utrymningslarm med talat meddelande through two entities — certificate 19-84 for the Helsingborg company, valid to the end of 2029, and certificate 17-529 for the Stockholm company — both to SBF 2018:1. Alongside voice alarm it delivers intrusion alarm, audiovisual and hearing-loop systems, and states more than twenty-five years working with voice evacuation across Sweden.