Bring your layout to life with authentic industrial sounds! This automated sound module features a circuit board with a voltage regulator, a sound chip, a built-in amplifier, a volume control, and terminal strips; a 50-second play time with an adjustable timer and continuous looping capability; and more. Can also be used with a pushbutton or a magnetic track sensor. Measures 1½"x 2½"x ½"; requires a 9-12V DC transformer and a 2" or larger 8 ohm speaker. #0R68611