Fascinating kit with a switchable 5-speed transmission. With around 200 plastic parts, you can assemble your own motorcycle boxer engine in about three to four hours. No glue is required - a pleasant modeling experience is guaranteed. The functional model is movable: the crankshaft, cylinder, and piston work together realistically, just like the original. The ignition sparks in the cylinders are simulated by LEDs. Thanks to the transparent design, you can observe the assembly, functionality, and mechanics of the two-cylinder engine at a 1:2 scale, first during assembly and then from the outside while in motion. A highlight is the detailed and switchable 5-speed transmission. Additionally, the functional model includes a sound module with a recording of the original engine. You can activate the sound at the push of a button.