Characteristics: 1. Made of good quality ABS material, sturdy, durable and wear-resistant. 2. Powered by sunlight, energy efficient and environmentally friendly. 3. The solar panel connects do the air pump power supply. 4. Three mode options: high quality, low quality, low quality enabled for 10 seconds, stop for 10 seconds. 5. It is super quiet without noise, which will not disturb the surrounding people and fish. Technical data: Main shell material: ABS Black kolor Cell Type: Lithium Battery 18650 Nominal voltage/capacity: 7,4 V 2400 mAH (with protection plate) Nominal voltage of solar panel: 10V Solar energy: 5 W Process: Polycrystalline glass lamination Air pump type: miniature air pump DC Rated air pump voltage: 6 V Noise: 60dB Min. Air flow: 1,4 l/min Operating Voltage: 5,5-8,4 V Max. Operating current: 150mA (high quality); 100mA (low grade). Static Current: 10UA Discharge Protection Voltage: 5,5 V Charging Protection Voltage: 8.4 V Solar charging time: 8H Operating modes: Mode 1: high quality (green light always on); working hours: one day and one night; flow rate: 1,3 l/min Mode 2: low quality (blue light always on); working hours: two days and two nights; flow rate: 0,7l/min Mode 3: low class; lights up for 10 seconds and stops for 10 seconds (green and blue lights are always on); working hours: three days and three nights Size: Approx. 27.5*17.5*1.7 cm/10.83*6.89*0.67 inch (solar panel) List of things do packing: 1 * solar panel; 1 * bracket 1 * air pump; 1 * air hose; 1 * three-way connector 2 * air stone; 2 * screw; 2 * Walnut 1 * Instruction! Note: 1. This product is an electronic product. The oxygenator must not be placed in water and the diffusion hole must not be blocked. 2. This product is a solar product. The charging speed is related to the strength of sunlight. Regularly remove dirt from solar cells to improve charging efficiency.