Know when to quench their thirst with a Smart Soil Moisture Plant Sensor with Light Indicator This intelligent sensor can identify the water content of any plant's soil Tells you exactly whether your plants need watering so you can keep them healthy Different coloured lights indicate the status of your plant: Green: moderate water levels Red: plant needs watering Blue: plant has too much water Requires a CR2032 battery (battery comes included) Measures 131 x 10.9 x 25.1mm Don't drown your plants - save 69% on this Smart Soil Moisture Plant Sensor with Light Indicator