The Magnetic Shaker is a handheld acoustic alarm equipped with a special internal magnetic system and safety lanyard. The Shaker is light and small in size, and is easily stowed in the BCD. It is operable with a firm downward hand motion, and the ideal tool for calling the attention of other divers underwater when necessary. The Magnetic Shaker is designed in Italy by Cressi and made in Taiwan. Cressi has been an Italian brand pioneer in scuba diving, freediving, and snorkeling equipment since 1946.