Size of module is 1.5" w x 2.75" t consist of voltage regulator and sound board 1 watt amplifier, & volume control screw Will play 1 time or continuous looping until turned off can be mounted in buildings, under the layout, and some cases in RR cars 1 cycle is 30 seconds long The speaker and switch is included Board will support a 2nd speaker speaker must be 8 ohm part numbers SPKR2 or SPKR2.5 Power source can be AC, DC, DCC track voltage 12 volt (PDC12) will run 6 modules and 2 LT modules recommended wire is 24 or 22 ga wire (24red & 24black)
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