Just 1 "D" battery provides the power for this portable Air Pump that's perfectly suited for smaller bait buckets. Simply clip it to your bait bucket and go! On / off switch. Includes 24" of tubing and an aerator stone. Specifications: Size: 3" x 5.25" - Skill Level: Beginner Expert Intermediate - Type of Water: Freshwater Saltwater - Fish Species: Bass Catfish Cobia Redfish Sea Trout Snapper Snook Tarpon Walleye 1 Pack of 1 Piston Pump Aerator.