The alarm consists of a laser infrared emitter and a light-sensing trigger alarm. When working, the laser infrared ray shoots to the light-sensing device, when there is an object blocking the laser infrared ray, the horn will alarm, the warning light will also light up.
Material: plastic, electronic components
Certification: 3C, CE
Type: STEM toys, DIY toys, building blocks, puzzle toys
Suggested Age: 9 years and up
Batteries: 4*AA (not included)
Warning: not suitable for children under 3 years
Note: this is a DIY kit, you need to assemble it