When you aren’t in sunlight or running water, you can use your action to transform in to a Tiny bat or back into your true form. While in bat form, you can’t speak, your walking speed is 1.5 meters, and you have a flying speed of 9 meters. Your statistics, other than your size and speed, are unchanged. Anything you are wearing transforms with you, but nothing you are carrying does. You revert to your true form if you die.