High quality:PVC material,won't get break in transportation or daily use.Under normal circumstances,a small watering device full filled with water can last about two days,a large watering device full filled with water can last about 2-3 weeks.If you want the watering device to leak more slowly,please insert the watering device deeper into the soil. SELF-WATERING:Plant flower automatic watering bulb ball irrigation tool,they can take good care of your plants when you are on travelling. Easy to use:Just fill with water,flip and press into the soil,it will self water your plants automatically. Watering on Working Days:Watering bulbs are great for potted plants,small plants,small house plants,succulents.The bulbs helps you to ensure plants are getting enough water. Design:Transparent plastic body,convenient for you to observe water consumption of plants,and adjust the water volume in globe according to it.You can also filled it with nutrient solution,perfect for looking after your plants.