This is a simple container to hold the Terro® T300 Liquid Ant Baits traps. You could also just put ant dust in it. The lid has an overlap to help it prevent water from entering through the top making it ideal for indoor or outdoor use.
I have tested this outside through rainy days and it has not accumulated any water inside. If it filled with water the ants would probably not go in or the ant bait would be washed out.