Designed for emergencies: The Penn Plax Air Charger Air Pump is USB Rechargeable and has a battery life of up to 13 hours of continuous use or 26 hours of interval use. Noise absorbent rubber base keeps the air pump quiet while it works at 1.5L/minute. This product has one outlet. Includes air tubing, a USB charger and air stone. LED battery power display. Simple to set up, read and adjust the settings for your emgerency air pump.