Description: 【Educational DIY Kit】: This DIY infrared alarm kit allows elementary school students to the principles of physics through hands on experimentation.  【Comprehensive Learning】: The Science Learning Kit covers essential scientific concepts such as light sensitive resistors, adjustable resistors, transistors, and control circuits. It's designed to enhance understanding of how electronic components work together in a simulated circuit 【Interactive 】:  This Physics Experiment Kit demonstrates how infrared light can be used for security purposes by  an alarm when the beam is interrupted 【Long Distance Functionality】: The DIY  infrared alarm can operate over distances up to 100 meters. When anything crosses the infrared beam within this range, it activates an audible alarm and warning lights 【Materials and Compact Design】: Made ABS  with metal fittings and electronic components, Science Experiment Electronic Project is sturdy for long term use ,compact design Specification:     Size Chart: Length: 6.4cm/2.52inch Width:7cm/2.76inch Height:7cm/2.76inch Package Includes: 1 DIY Science Experiment Kit Note: 1.This is not infant toy , please take away from children to avoid eating. 2.Please allow slightly errors 1-2cm differences due to manual measurement.