• The perfect item to protect your family from CO Advanced protection, easy to read through the digital display even in low light
• The siren pattern is four short siren sounds. When in alarm mode, the red LED will flash
• A beep every 30 seconds to indicate the battery is low (requires replacement) (green LED still blinks every 30 seconds)
• Test/Reset button to test device electronics and verify proper operation of the device, and reset the device during a CO alarm
• Alarm memory function: If the device is ever alarmed, press the button, the green LED will flash once per second for one minute, and the peak alarm level will be displayed on the LCD
• Green and red LED lights indicate normal operation and alarm status
• When powered on, the device will chirp and the red LED will flash once
• Green LED: Blinks every 30 seconds to indicate normal operation of the device. The green LED also flashes before taking a CO reading and when any button is pressed
• Red LED: When dangerous levels of carbon monoxide are detected, the red LED will flash and sound a loud alarm pattern
• The CO alarm pattern is 4 short beeps, followed by 5 seconds of silence, then 4 short beeps and the corresponding red LED flashes. This cycle will last 4 minutes and then change to 1 cycle per minute until the device is reset or the CO is eliminated

Specifications:

• Item model number: CO999
• Detection gas: CO
• Alarm method: press the button on the spot, sound + flash to apply for employment
• Power supply: DC4.5V (3 x AA batteries, not included)
• Measuring range: 0-999ppm
• Alarm sound: ≥75dB (1m in front)
• Alarm concentration: bright screen at 50ppm, alarm at 150ppm
• Working environment: temperature -20~60℃, relative humidity <95%
• Product size: 10 x 10 x 4cm