Annic 8pcs Creative Self-Watering Probes - Indoor Automatic Watering Device for Plant Made of premium environmental material This watering device is automatic that perfect for seeding and planting. Help you a lot if you go on vacation or always forget to water your plant The operation is really easy. First, unscrew the green cap. Then put ceramic probe fully in water to soaking for appr. 15 minutes. Next, fill each part with water. Finally put one side of the tube in a vase or bowl of water, and the probe in plant According to different degree of plants' water requirement, you'd better use one watering device on a pot with 15cm diameter Cable Length: 29" (740mm). Package includes 8 pcs