Features: - Compact structure, smooth surface sharp bottom, do no harm to plants rhizome. - Made of selected environmental ABS material, non-toxic tasteless high hardness, anti-aging and long service life. - Adjustable valve to Flexibly control droplets speed, saving water. Ordinary 550mL bottles can work for 5 to 7 days, and 2L bottles can be used for 7 to 20 days. - You don\' t need to punch the bottom of the bottle, plug-and-play, easy to install and remove, labor time saving. - Suitable for most bottles with 28mm/1.1in diameter to water various plants.