①. Electric universal driving, equipped with universal wheels at the bottom of the car, will automatically turn when encountering obstacles during driving, with playability. ②. Battery installation display: Open the battery cover, install 3 No. 7 batteries (excluding batteries), install the batteries, cover the battery cover, and open the light to play. ③. Detachable carriage: Each carriage has corresponding buckles and rings, which can be aligned and tightened for play. ④. Easy installation of the carriage: The buckle and snap ring can be aligned and tightened for play. ⑤. The appearance is smooth and free of burrs. The automatic universal wheel is a simulation of a harmonious train, helping children fulfill their high-speed rail dreams. ⑥. 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: 210 g, 248 g, 290 g Package Include: 1x Harmony Train Toy