Carbon monoxide detector - Wikipedia

Carbon monoxide poisoning - Wikipedia

Tin(IV) oxide - Wikipedia

MQ-7 Gas Sensor - Waveshare Wiki

Carbon monoxide poisoning - Wikipedia

Crankshaft position sensor - Wikipedia

Smoke detector - Wikipedia

Optical beam smoke detector - Wikipedia

Smoke detector - Wikipedia

Ambient light sensor - Wikipedia

Smoke detector - Wikipedia

Carbon Monoxide CO Meter by Forensics, USA NIST Calibration, Dust & Explosion Proof, USB Recharge, Sound, Light and Vibration Alarms, 0-1000 ppm