Hardly used. No water浸水 inside. Outer box and stone are included. ◆ Powerful oxygen supply of approximately 3.0L per minute ◆ Ideal for spear squid and sweetfish fishing ◆ Microbubbles quickly penetrate the water ◆ Water-resistant and washable (IPX6 equivalent) ◆ Switch lock mechanism to prevent accidental operation ◆ 4 x D-cell alkaline batteries (sold separately) ◆ Continuous operation for approximately 70 hours (on low setting) ◆ Can operate with 2 batteries (low setting only) ◆ Fishing hardware included ■ Specifications ■ Batteries used: 4 x D-cell alkaline batteries (sold separately) Battery life (continuous operation) ... ・High: 24 hours ・Low: 70 hours Airflow (approx.) ... ・High: 3.0L/min ・Low: 1.5L/min Hose length (approx.): 60cm Motor life (approx.): 1000 hours Waterproof performance: IPX6 (water resistant) Body size (approx.): Width 81 x Depth 42.5 x Height 197.4mm Body weight (approx.): 300g (excluding batteries and stone)