Engineering vehicle sliding function; The excavation arm can rotate 360°, can swing up and down, with a clicking sound; when the excavation arm fastens the groove of the roof, it can be used by variable hand; 360° mechanical crane, the boom can be removed, the hanging basket can be lifted, and the base can be used alone; the track, slideway, gas station and maintenance shop model, can be freely assembled and disassembled; with light and sound (pure sound effect, without Chinese or English); with 2 engineering alloy vehicles, 12 road sign barricades; battery: 3*AAA, no electricity.