With its big red “HELP” button and associated transmitters including a portable emergency pendant, a single press of the button can start an emergency signal to be sent to the Central Monitoring ...

The 1510A Precision Signal Source generator available from MTI Instruments is a compact and portable device and includes dual-channel Direct Digital Synthesis (DDS) that creates high precision signals ...

NHK provides two types of emergency broadcasts ... with constant reception of One-Seg signals limits the method's feasibility on a small portable receiver like a cellular phone.

With its big red “HELP” button and associated transmitters including a portable emergency pendant, a single press of the button can start an emergency signal to be sent to the Central Monitoring ...