Stock Photo - 10 December 2020, North Rhine-Westphalia, Wuppertal: Homeless Björn attaches an alarm system, the so-called ""Clochard Alert"", to his backpack in the city centre. Researchers from the Ruhr-Universität Bochum developed the mobile alarm system for homeless people together with the association Unsichtbar e.V.. Initially, 20 units will be tested; if successful, up to 200 will be produced. Theft is a big problem for homeless people. (to dpa ""To protect belongings: Mini alarm system for the homeless"") Photo: Jonas Güttler/dpa. - Wuppertal/North Rhine-Westphalia/Germany

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