What's in the box:

Smart Robot Car Assembly Kit Two Wheels Intelligent Obstacle Avoidance Tracking Wireless BT Remote Control Small Car Chassis DIY Kit Set (Multicolor)

Features:
Simple mechanical structure, easy installation, a complete set of kits, go immediately after assembly.
Multiple functions to facilitate your expansion experiment -- using high frequency sound ranging to achieve the obstacle avoidance, infrared detection to achieve black and white tracking, wireless BT communication to realize remote control, and other basic actions.
Comes with a rocker switch, easy start-stop, highly integrated system.
The battery box can hold four batteries, convenient for the entire power system.
100% brand new and high quality; good DIY car assembly kit suit for intelligent robot car beginners, with high playability.

Specifications:
Material: plastic, metal, organic glass
Power Supply: battery (not included)
Power Supply Voltage: 3-12V
Package Size: 25 * 18 * 8cm / 9.84 * 7.09 * 3.15in
Package Weight: 431g / 15.2oz

Package List:
1 * car chassis
2 * car wheel
1 * omni-directional wheel
4 * M3*30 screws
4 * M3*8 copper cylinder
10 * M3*8 screws
2 * code disc
10 * M3 nut
4 * T-shaped bracket
1 * rocker switch
1 * battery box(without battery)
2 * gear motor
4 * fasteners (high intensity black acrylic)
1 * V5 sensor shield
1 * L298N (motor drive module)
1 * UNO R3 controller board
1 * SG90
1 * HC-SR04 (obstacle avoidance module)
1 * USB cable
1 * screw driver

Note:
Due to different producing batches, product details might be a little different, please buy it carefully.