Speakercraft CTL02002 Speaker Level A/B Switch Dual relays handle music power levels up to 100W Octal switch provides precision delays from 0.5 seconds to 5 minutes to handle any music energy interval without false switching Sense level permits adjustment to accommodate a wide range of music level conditions for best switching threshold B status 3.5mm output jack provides 12V trigger to local devices where desired Isolated ground paths permit use of BTL (bridged) amplifiers