Features 1. Electric universal drive, equipped with universal wheels at the bottom of the trolley, will automatically turn when encountering obstacles during driving, with high playability. 2. Battery Installation: Open the battery compartment, install 3 No. 7 batteries (batteries not included), install the batteries, replace the battery cover, and turn on the light to play. 3. Detachable Trolley: Each trolley has corresponding buckles and rings, which can be adjusted and tightened for play. 4. Easy Trolley Installation: The buckle and snap ring can be adjusted and tightened for play. 5. The exterior is smooth and free of burrs. The automatic universal wheel is a simulation of a harmony train, helping children fulfill their high-speed train dreams. Specification Material: Plastic Cement Style: 551A-1 three sections, 551A-2 four sections, 551A-3 five sections Color: White Size: 41.5 x 5 x 6.5 cm 52 x 5 x 6.5 cm 62 x 5 x 6.5 cm Weight: 210g, 248g, 290g Package includes: 1x Harmony Train Toy