It starts to work when placed in water and will not operate when removed from water. When the battery is depleted, the product will resume operation after being charged to 3.5V by sunlight. Features: [Solar Power] Powered by solar energy, no electricity required. Utilizes sunlight for operation, making it energy-saving and environmentally friendly. [Working Mode] The oxygen pump operates for 10 seconds and pauses for 10 seconds. Recommended for use in small ponds or localized areas requiring oxygenation. [Easy to Use] Connect the tube and air stone, place in water. The aerator pump will float and begin operation. [Low Noise] Stable and quiet oxygen pump with noise levels under 60 decibels and an air output of 0.8 liters per minute. [With Battery] Built-in 3.7V 2200mAh lithium battery stores solar energy, allowing the oxygen pump to function during nighttime. Specifications: Material: ABS Color: Black Battery: 1 x 3.7V 2200mAh Lithium Battery Solar Panel: 6V/2.5W PET Monocrystalline Silicon Lifetime: 10000 Hours Solar Panel Shape: Round Rated Voltage: 5V Noise: Less than 60dB Max Flow: 0.8L/min Working Mode: Operates for 10s, stops for 10s Waterproof: IP65 Working Time: 16 hours Charging Time: 5–6 hours Working Temperature: -10°C to 45°C Application: Small Pond Solar Panel Diameter: 18cm / 7.08inch Package Size: 19 x 19 x 6cm / 7.48 x 7.48 x 2.36inch Package Weight: 400g / 0.88lb Package List: 1 x Solar Aerator Pump 1 x Bubble Stone 1 x Pipe Note: 1. Solar panel performance may vary based on weather conditions and geographic location. 2. Do not operate the pump outside of water, as this may reduce its lifespan. 3. Clean the pump regularly. Accumulated debris may cause malfunction. 4. The package contains small parts. Keep away from children and pets to avoid risk of suffocation.