Smart Air Monitor – Kids’ Science Project

Oxygen Defender - Kids' Air Quality Science Kit Teach children about environmental science with this interactive air quality monitor! This project visually demonstrates how trees produce oxygen and purify air by comparing a green zone vs. polluted zone. When air quality drops (low oxygen/high pollution), the buzzer alarm activates, showing kids the immediate impact of pollution. Key Features: MQ-2 Gas Sensor detects LPG, smoke, propane, hydrogen Visual green vs. polluted zone comparison Loud 5V buzzer alarm activates when air quality drops Rechargeable 18650 battery (3.7V) with charging module 3.7V to 5V boost converter for stable power Easy-to-assemble components with color-coded wires Perfect for school projects and STEM education What's Included: MQ-2 Gas Sensor Module 18650 Battery with holder and charger Voltage boost converter module BC557 PNP Transistor 5V Active Buzzer Connection wires Step-by-step instruction manual