CasStar Self Watering Probes - Vacation Plant Automatic Waterer System, Set of 4Pcs Plant Feeder: You can combine water and fertilizer by our water soluble fertilizer delivery system. Vacation Worry-free: Automatically adust soil moisture with the just-in-time watering based on capillary action. Flexiblity: Add more probes for the big plant. One probe draw water up to 8-inche (20cm) pot. Durable: Made by ceramic and durable resin. This watering probe can be a high quality long-lasting product. Specification: 4.1*1.2*1.2 Inches with 30 Inches Hose Length. 4 Pcs in one package.