A green lamp flashing every 2 hours indicates goodhumidity, lamp flashing every 6seconds indicates a mediumhumidity, and water appropriately, a redness light flashing every 6seconds indicates that the soil is dry and waterings is required immediately. With this product, you could clearly know the water shortage of plant and avoid improper waterings to cause plant death. ABS , resistant and long service life. Monitorings of the soil and water content, , accurate measurement. Package includes: 1x Water