Adjustable Speed Design: The plant watering device with control valve can control the dripping speed. You can adjust the traffic from 3 to 20 days or more depending on the time needed and never kill your plants because the water flows too fast or sluggishly.^ Accurate water volume: Provide different amounts of water for different plants and flowers, do not become plant killers, other watering equipment is either too little or too much for some plants, old leaves simply turn yellow and fall, but when new growth yellow, This can be an indication of above or below sea level.^ Easy to Use: Without tedious installation, all you need to do is cut a hole in the bottom of the bottle, tighten the drip irrigation watering devices, and then insert them into the ground, no nail required and no danger.^ Suitable for Brand Bottles: Bottle cap design, suitable for any drinks, such as Pepsi, Cola, Dasani water, Dr.pepper, Deet Coke, Coca Cola, easy to find.^ Worry-free Planting: The automatic plant watering apparatus is a helpful assistant for gardening. You don't have to take care of your plants every day. All you have to do is adjust the flow rate of our device to meet the needs of your individual installations. Enjoy your vacation or business trip, leave your plants to me!