This fish robot swings its tail from side to side while swimming along. The main body stays underwater while the dorsal fin protrudes when it swims. The Submarine Motor Mini and Underwater Gearbox move the tail via a crank and linkage rod mechanism. The main body, fins, and foam float are all conveniently included in this easy to assemble set. Tamiya and mechanical fish logos as well as two kinds of eye stickers are included.