PRODUCT HIGHLIGHTSSingle-tone sound module: preset as triangle toneSingle-tone module can be modified through a DIP switch to produce 1 to 13 different tonesDual-tone sound module preset: triangle tone/continuous toneDual-tone module can be modified through a DIP switch to produce 1 to 15 different dual combinationsVoltages available: 24V AC/DC or 110V ACProtection rating: IP54Housing: blackOnly one sound module per stack fitted at topMaximum of four modules per stack with dual tone unitAll modules in stock must have a common voltage