General description Light and Sound Alarm Warning: When a dangerous level of carbon monoxide is detected, the red LED flashes and the alarm emits an 85 decibel sound to protect your family's life and property safety from carbon monoxide exposure. Technical specifications Power supply: DC 3V (2 AAA size batteries) Sensor type: Electrochemical gas detection Gas detected: Carbon monoxide Material: ABS Alarm sound level: 85 dB Alert times: 50 ppm (60-90 minutes), 100 ppm (10-40 minutes), 300 ppm (3 minutes) Compliance: EN 50291 standard