Adjustable watering flow. The water flow controller allows you to adjust the flow rate to deliver water continuously or use up to 1 drop every 90 seconds. Battery life ranges from 1 to 15 days depending on settings. Ease of use: No lengthy installation required. Simply cut or pierce the bottom of a bottle, attach it to the bottle and press the cone into the bottom. Bottle compatible: The drip-free cone is compatible with most baby bottles. Watering cone holder: Each watering cone comes with a holder that keeps the bottle in place even in high winds. How to use: Insert the control valve into the watering cone. Cut or pierce the bottom of the bottle. Regulate the water flow. Turn the bottle over and press the cone into the bottom.