General description Mini size carbon monoxide detectors, even smaller than a palm, designed for home and travel. These compact alarms feature a CO digital display and sound alarm, providing powerful protection against carbon monoxide exposure. Technical specifications Advanced electrochemical carbon monoxide sensor Alarm levels: 50ppm (alert within 90 minutes), 100ppm (alert within 40 minutes), 300ppm (alert within 3 minutes) Power source: 3pcs 1.5V AAA batteries (not included) Alarm volume: 85 decibels Dimensions: Measurement allowed error is +/- 1-3cm Material: ABS Color: White Installation Easy to install with no rewiring required Place one detector on each layer of your home and in every bedroom for complete protection Usage Simple operation with a single test/reset button Red LED flash indicates dangerous carbon monoxide levels Do not test the detector by blowing gas directly into the hole Other information Package Contents: 2 x carbon monoxide detectors Note: Light reflection