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You can search Ghost using Baketan!
Push the button. Then it starts searching for Ghosts!
It keeps blinking for about 10 seconds.
If the circumstance around you is nomal, it ends blinking (shortly, it blinks 3 times in the end).
But if something unusual around you, it cautions you by blinking in red continuously with some buzzer sounds!!
OH MY GOSH!!!
Go here and search "BAKETAN"!