Hello, Food Wars Rats can only be installed on the star gun.

The skill cooling time is about 1 minute and 30 seconds (visual data, there is an error of about 10 seconds). If you do not have enough financial resources to strengthen the gem to 7 stars, it is recommended not to use it - because of the low-star light gem. The number of stars is very small, and you can only get a hundred or even dozens of points with a single move! Since this gem can only come from the wishing well, it's expensive!

I hope the above information can help you!