There are two sizes the 4.25 gallon Shrimp Shak and a smaller 2.5 gallon size. Both versions have a Styrofoam liner to keep the water cooler longer that really works. I can leave bait outside in the Florida heat overnight and they are ready to go in the morning. The aerators use 2d cell batteries that will run for about 20 hours. The aerator puts out plenty of air and is very quiet as compared to other aerators I have seen. It is plastic and corrosion resistant metal. I have fished with this for over a year and it shows no significant wear or corrosion. It is very durable and dependable.

I like to fish the morning falling tide for Reds, Trout, Flounder, etc. I use my Shrimp Shak all the time. The SHak allows me to do this. I catch or buy bait the day before and use the Shak to keep them frisky until I can fish the morning tide. I have not lost any bait using the Shak. I just bungie to the back of my Yak and off I go. I do cycle the unit while fishing sometimes just to eliminate all noise but I haven't seen the Shak making enough noise to spook most fish.

The larger unit stores more bait but is a little large for my preferences on a kayak. That is the only reason I went for the smaller unit. Another advantage to a heavy bucket is I don't have expend paddling energy to drag it behind my Kayak.

This is the best aerated bait bucket I've found and recommend it for those needing to store and keep bait alive.