Just place the lit lighthouse on the space provided on your Lighthouse board or modified Railroad or Golf board and the embedded magnet will activate the LED light in the lighthouse in a realistic pulse.
To turn the light off, just remove it form the board.
The lighthouse is powered by three removable LR44 or SR44 batteries, commonly available at hardware stores and drug stores.
We have run a lighthouse for several months straight without needing a battery change so in intermittent use the batteries should last a year or more!
You should be able to see a demo here: https://www.youtube.com/watch?v=fMIeKmD5vlc&feature=youtu.be