Accessories Inside the Pump: Contain a small air stone and 2-foot frosty clear airline tubing Inside The Pump Body. Extremely convenient for basic aeration setup outdoors! Battery Powered: Driven by 2 D batteries (Not Included). An essential and reliable backup air source ? Great to be used during outdoor fishing, power outage or fish transportation. Steady Output: Work great on 5 to 30 gallon fish tanks or buckets. Max flow rate: 40 GPH; Pressure: ? 0.012 MPa. Supplement oxygen in time to keep your fish and bait alive and fresh. Quiet Aeration: Give out noise less than 45 dB like the low hum of a refrigerator. It will neither disturb your sleep indoors nor scare the fish away when fishing outdoors. Light Portable: Size: 5.6" L x 3.1" W x 1.6" T. Really lightweight and space-saving. Just install 2 batteries to go out immediately. And the metal clip makes it easy to be fixed on your fish tank or bucket. Product description 1 2 D Batteries 2 Accessories in the Pump 3 Easy to Use 1 Ultra-quiet 2 Portable to Carry