Generates the sound of a vintage steam engine. Adjustable 'speed' and volume. Great for model railroads, radio plays, stage or as a gadget. With 'steam whistle'-push button.
Specifications:

1. power supply: 9V battery (not incl.)
2. comes with 8 ohm/0.5W miniature speaker
3. dimensions: 100 x 83mm / 3.9 x 3.3"

manual_hwsah134.pdf

module_diy_kit_guide.pdf