Ram 71 Big Ship Whistle (2" Speaker 9-18V)

Deep and distinctive whistle sound heard on ocean liners and large
cargo ships
1 x 2" (25.4 x 51mm) circuit board
May be controlled by a mechanical switch and servo, or an electronic
switch such as the Ram 35 (RAMQ2312),
or the Ram 76 X Tra Control
9V battery connector
2" (51mm) diameter speaker

#71 Big Ship Whistle with 9V Battery Connector, Speaker, and
Instructions