Product parameters: Cell type: 18650 lithium battery Rated voltage/capacity: 3.7V 1800mAH Solar voltage: 6V2.5W Solar panel current: 420MA Process: PET lamination Oxygenation pump parameters: Air pump type: AC air pump Rated voltage: 3.5V Maximum current: 450MA Noise: 50dB Minimum air flow: 1L/min Circuit parameters: Working voltage range: 3.0V-4.25V Maximum working current: 450MA Over-discharge protection voltage: 3.0V Over-charge protection voltage: 4.25V Working time: about 22 hours With or without light control: without light control Product weight: 0.65kg Product size: 21.5X17.5X7CM Working mode (modes): Mode 1: high-end (green light is always on) Mode 2: low-speed (dark blue light is always on) Mode 3: low-speed Open for 10 seconds and stop for 10 seconds. (sky blue light is always on) instructions for use: Bubble stone and exhaust hole connection in the need to increase the oxygen of the water body, solar cells in sunlight, solar cells and sunlight enter no shade, press the