The base comes with 2 continuous rotation servos and wheels already mounted. The breadboard with ESP32 should also be mounted. A piece of double sided tape holds the breadboard down. Don't try to remove the breadboard, it could come apart. The kit also contains
some cable ties
some jumper wires
some male to male
some male to female
some very short with insulation
some very very short with no insulation
some LEDs
an Ultrasonic Module (already hot glued to a bracket)
a wood peg
2 LEDs
2 x 150 ohm resistors (brown, green, brown)