With this product, you could clearly know the water shortage of plant and avoid improper waterings to cause plant death 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 It is suitable for all indoor and outdoor plant by adjusting the depth of insertion into the soil ABS, resistant and long service life Monitorings of the soil and water content, rapid responses, accurate measurement, Manufacturer: LiRRvb