Here is another cool wave machine that puts on a relaxing show as you turn it on. This Spencer’s Wave FX Wave Motion Machine has a 16-inch long vessel. The base rocks it back and forth to generate calming wave effects. It is powered by a 6V adapter.
Spencer's Wave FX Wave Motion Machine 🌊 Gadgetify
There is a version of this with tiny dolphins inside. Both models work the same way. The above video shows this wave machine in action.
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