1:with 2nd lock 

2:Front seat with 2 position backrest.back seat with 3 position backrest.

3:Standard 5-point harness.

4:Front wheel7''*4pcs with swivel or fix,

   shocking-proof ,and detachable.
5:Rear wheel 7''*4pcs with independence brake,

   chocking-proof and detachable.

6:with front bumper.

7:Easy fold and unfold chassis.