Dual Outlet Aquarium Air Pump AC/DC Quiet Oxygen Pump Adjustable Fish Tank Aerator Features: Double-layer sound insulation, airtight cover, bedroom-level mute (≤30dB) Multi-mode optional: M button, short press intermittent mode, long press for 3 seconds to enter standby mode Built-in lithium battery, long battery life; automatically start power supply after power failure, one-key standby Using full-wave technology, the gas volume is super strong; 5-speed gas volume adjustment, the gas volume and power are synchronized, and the product is energy-saving Wide range of application scenarios, suitable for family fish tank, fresh food transportation, field fishing, etc.