Lechuza 15577 Delta 20 Self-Watering Garden Planter, Espresso Metallic DELTA 20 is the perfect way to bring your windowsill to life Made in Germany of durable frost and UV resistant PP plastic for indoor use Simple yet elegant design complements any decor Self-Watering System features inorganic granulate compounds that provide the right amount of water to plant roots A water-level indicator lets you know when it is time to refill the reservoir