The Bubble Box is great for use with buckets, coolers or small tanks. It runs up to 30 hours on two D-cell alkaline batteries (not included). Aerates up to 7-1/2 gallons and has adjustable stainless steel mounting clip, air stone and overlap case construction for quietness and durability. Works with freshwater or saltwater.
I have had one of these Bubble Boxes for about 14 years and it has done the job over and over again. I am not sure about getting 30 hours out of a set of batteries but then I bet the brand of batteries matters also. I have never had to replace the air stone either. I don't use it like a professional but I average 15 trips a year and also use it at home to keep bait from week to week sometimes. If I had two minnow buckets, I would have two Bubble Boxes!!!
You get far more than your money's worth with this little baby! The Bubble Box is a must-have, especially for crabbing, if you like to eat the freshest catch possible. From a battery standpoint, the product claims a battery life of 7.5 hours, but I have run mine for twice that time already without changing the batteries.