Package Contain: (sesuai gambar) A car chassis Trolley wheels 2 DC Gear Motor 2 Speed encoder 2 Fasteners 4 Caster 1 Four batteries box 1 A high-quality rocker switch An assembly drawing Several screws and nuts Bahan Bacaan: https://smartarduino.gitbooks.io/user-mannual-for-esp-12e-motor-shield/content/index.html http://apcmag.com/arduino-projects-the-rolly-mk-ii-robot.htm/