Dry Battery Type Air Pump YH-734C (for 2 AA batteries).The quiet driving sound makes it ideal for ayu and squid fishing.Quiet driving sound.The air volume can also be adjusted, and it is effective for long-term movement of Ayu fishing.[Battery life] Continuous 25 hours (strong) / 75 hours (weak) (alkaline).[Blast volume] Approx. 1.3 L/min (strong) / Approx. 0.6 L/min (weak).[Motor life] About 1,000 hours.Washable type