Bubbling, bubbling. From Yokohama City, Billnex Co., Ltd.'s high-power pump for live fish transport. This is a used air pump, sold as a single unit. Although there are photos showing two, it's only one unit. Please be aware. From the website description: ↓ High Power High-power design with an initial output of 1,900cc/min or more. Maintains a high output of 1,200cc/min or more even after 30 hours of operation. Reliable Domestic Manufacturing Billnex's power pumps are developed and assembled at domestic design institutions. Before shipment, all units undergo inspection, and thorough quality control ensures reliability. Long Operating Time Achieves an operating time of over 30 hours while maintaining a high output. (When using domestic-made manganese dry cell batteries at a water depth of 25cm). Furthermore, when transporting for extended periods, using alkaline dry cell batteries allows for over 70 hours of use. That's all. The batteries are different from the photo, but I will include two batteries. (Used only once for about 24 hours) "Power Pump" Please see the Billnex website. January 19, 2026, morning When I put in the batteries, It bubbled vigorously and strongly. It takes two batteries, but it works with one. They are connected in parallel. Will be shipped via Yu-Packet Plus. For fishing enthusiasts and others, please take this opportunity! Type of fishing/fish species...Other Type...Other #FishingTackle #LiveBait #Goldfish #Turtle #PortablePump #AirPump #PowerPump #Fishing #Bubbling #Bubbling