Forget the days of over-watering or over-drying, and bring on the Hydrofarm Thirsty Light. This innovative plant accessory helps gardeners provide the perfect amount of moisture to plants so that they remain healthy and vibrant in your home our outdoors. The LED sensor will blink to alert users that it's time to water, while it's designed to be unobtrusive when left in the soil. It senses five different levels of dryness and blinks faster as the dryness increases. The fifth level (completely dry) will cause the device to go into standby mode, emitting a slow triple blink every three seconds. Complete with a comprehensive user and watering guide.