Bug Jar When a fly gets trapped in the house it may be a nuisance for you, but for kitty it's party time. When she sets her sights on that pesky little buzzer, the chase begins and nothing can stop her until she takes it down. But it's not every day that a fly gets trapped in the house. With Bug Jar, the chase is on all the time. This toy is powered by a small battery-operated fan that causes little (harmless!) pretend glow-in-the-dark bugs to fly around the jar. The jar was designed with a weighted rocking base so that your cat can swat at it for as long as she wants without tipping it over.