Dry Battery Type Air Pump (With Marker Function) YH-739C (for 2 AA batteries).The LED lights up during operation, and you can find out where you are even at the beach at night.Ceramic stone with fine bubbles.Powerful type that blows 1.5L/min.Can be washed with water even if it becomes dirty.[Battery life] Continuous 15 hours (strong)/45 hours (weak) (alkaline).[Blast volume] Approx. 1.5 L/min (strong) / Approx. 0.7 L/min (weak).[Motor life] About 700 hours.Marker function.Washable type