This is a wireless radio control microprocessor receiver to be used together with the ART-5470 Train Engineer. You can control up to 20 switches, 10 accessories, and an on/off operation (such as lamps or sound systems). You will be able to control10 whistles or horns, and 10 bells. It has a wide voltage range of 5-16V DC, and is also designed to operate sound systems. LED power light (red) and signal light (green). You can connect a whistle/horn, bell sound function too.
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...more about the Crest DC/RC Wireless Accy Switch