A set of four HO gauge painted station platform staff with a preprogramed soundboard and speaker to create the distinctive and familiar sound of a guard's whistle, by Faller.Add the next level of authenticity, ambience and realism to your diorama or simply have some family fun with this set of four painted station staff and sound effects capsule by Faller.The included figures are regular models that can be placed anywhere at your discretion. The sound effect comes from a separate soundboard and speaker that can be hidden under the baseboard or in a suitable model building of your choosing. Wiring is simple and connects to a 12v DC or 16v AC auxiliary power supply.A switch is not included in the pack as there are a number of ways the sound effects can be triggered, from a simple on/off or 'push to make' switch to an automated system of reed switches combined with a relay, the choice is yours but needn't be complicated.Once supplied with power, the sound effect lasts for a duration of 5 seconds and can be re-triggered at any time.There are two main components you will need to find a home for, a soundboard measuring 45 x 25 mm and a speaker measuring 35 x 20 mm. Neither component has a depth of more than 10 mm. A length of wire 170 mm long is already attached to the product for connection to a power supply or switch.Faller sound capsules are undoubtedly a simple and effective way to add another dimension to your layout or diorama. Are you choosing figures for an arts and crafts project? OO/HO gauge offers the best range and variety of figures on the market. We want your project to be a great success and we are sure you will be delighted with your purchase, but please be aware that the average OO/HO gauge figure measures 2cm in height. If you require something a little larger, O gauge (approximately 4cm tall) or G scale (approximately 8cm tall) may provide you with a great solution.