It will start to work when it is placed in water. It will not work when it is out of water. When the battery is used up, the product will continue to work after being charged to 3.5V in the sun.Features:[Solar Power]Solar energy powered, no electricity needed, just the sunshine, energy-saving, and environmentally friendly product.[Working Mode]The oxygen pump works for 10s and stops for 10s. It is recommended to install in a small family pond, and a small area of the pond to increase oxygen.[Easy to Use]Connect the tube and the air stone put it in the water, the aerator pump will float in the water and work.[Low Noise]Stable and silent oxygen pump, the volume is less than 60 decibels, and the air output is 0.8 liters/minute.[With Battery]Built-in 3.7V 2200mAh lithium battery to store power, so the oxygen pump can also work at night.Specifications:Material: ABSColor: BlackBattery: 1*3.7V 2200mAh Lithium BatterySolar Panel: 6V/2.5W PET Monocrystalline siliconLifetime10000 HoursSolar Panel Shape: RoundRated Voltage: 5VNoise: Less than 60dBMax Flow: 0.8LminWorking mode: Works for 10s and stops for 10sWaterproof: IP65Working time: 16hCharging time: 5-6hWorking temperature: -10~45Occasion: Small PondSolar Panel Diameter: 18cm / 7.08inchPackage Size: 19*19*6cm / 7.48*7.48*2.36inchPackage Weight: 400g / 0.88lbPackage List:1 * Solar Aerator Pump1 * Bubble Stone1 * PipeNote:1. Working power of the solar panel will be influenced by weather, location, etc.2. Don't make the pump work without water, or its lifespan will be shortened.3. Clean the pump regularly. If it's a duty, it will stop working.4. The packing contains small parts so please keep them away from children and pets.(danger of suffocation)