1 x automatic crossing signal board controller train detector device trigger

Price is for 1 reed switch controllercrossing signal board flasher ( sell separately ) controller device controller    Functions:what can this reed switch board do?control the crossing signal flash board by the train automatically ( you need to buy the flasher board separate )turn on/off lights or other devices by train automaticallyuse it with the crossing signal sound effect board ( sell separately ) trigger them automatically by trains....