The Nano Sub from Taiyo is a small submarine you steer by radio. Model and hand-held transmitter come in the box together; the transmitter has a rocker for up and down, a four-way pad for direction and a power button.
The link runs on 27 MHz, as the roundel in the top left corner of the packaging shows. The icons along the side show what the model does: dive and surface, run forwards and take turns.
The model in the box is yellow with a black rear section and carries the marking N5. According to the sales information listed for this barcode, the submarine has a built-in battery that is charged from the transmitter; the packaging photograph does indeed show the lead between transmitter and model.
The box states 6+. A present for a child who likes steering something and would rather have water for it than a carpet.