In some cases, the warning signal may be played by a mobile system installed on the fire department's vehicles. The warning signal is described by décret (by law) of March 23, 2007. It consists in a modulated sound going up and down (up to 380 Hz) during the first minute, and repeated three times. The end of alert is a continuous signal lasting 30 seconds. The system is tested the first Wednesday of every month at 11.45 in the north, 12.00 in the center, and at 12.15 in the south; for tests, the modulated signal is played only once. When the warning signal sounds, people are expected to remain at home or the building they are in and listen to further instructions on radio via France Info, France Inter, or local stations. Instructions may also be announced by police or fire department vehicles. Japan The J-Alert system launched in 2007 aims to allow government officials to address the population directly via loudspeakers. It aims to cover earthquake, tsunami, volcano, and military emergencies. The Earthquake Early Warning system is operated by the Japan Meteorological Agency. It is capable of delivering warnings a few seconds before S-waves can propagate to distant locations. Warnings are broadcast by radio and television stations, and compatible equipment can automatically turn on when receiving a message. EEW capability is also required for all domestic cell phones sold after 2007. JMA also issues advisories regarding tropical cyclones in the western Pacific Ocean. New Zealand South America Many countries in South America have a mechanism called "cadena nacional" (). It enables the leader of the country to address the people simultaneously on all TV channels and radio stations, interrupting normal programming. In some countries, such as Argentina and Venezuela, the broadcast of these messages is obligatory. Many of these systems were created by past military governments, and political use of the mechanism is common. Chile The SAE (Spanish: Sistema de Alerta de Emergencia; English: Emergency Alert System) was created as a response to the 2010 Chilean Earthquake after the failure by the national authorities to provide safety precautions and speedy information during the aftermath of the disaster. Since its inception in 2012 and through its official implementation in 2017 onwards, it has been used to provide alerts and information regarding natural disasters such as floods, wildfires, tsunami and earthquake warnings. All cell phones on sale in the country are