Is your plant getting the right amount of water? Know for sure with Doctor Frog®. Simply insert the unit into the soil and it will alert you when your plant needs water. This friendly little frog will chirp and croak until your plant gets the water it needs. No more guess work or under watering. Doctor Frog constantly evaluates the moisture level of your plant"s soil. A special light sensor ensures your plant"s watering schedule will be limited to daytime hours because this frog is only active when exposed to light. Doctor Frog will help keep your plants happy and healthy.