Carbon Monoxide Alarm Detector Voice Alarm Safety Sensor Without Cell

Features:
Portable in size and weight, easy to install on the ceiling or wall with included screws, leave no trace.
ABS material cover, high quality, eco-friendly, sturdy and durable.
Red and green indicator light, accompanying with a loud alarming sound, to ensure personal safety.
Replaceable cell supply voltage, energy saving.
High definition screen, read data clearly.
Flexible and sensitive reaction speed, protect family and other places' safe.