[JUST ONE] YMDJL Carbon Monoxide Detector 2 Pack, Battery Operated High Accuracy CO Alarm with Sound Warning and Digital LCD Display (2AAA Batteries NOT Included)

1. When the alarm is in the off-screen state, the green LED will flash once every 15 seconds, indicating that the alarm is in normal state. 2. When the alarm detects that the CO concentration exceeds 50PPM, the LCD screen lights up, indicating that it has entered an alarm state. 3. When the alarm detects that the CO concentration exceeds 300PPM, the LCD screen lights up, the red light flashes and an alarm sounds, indicating that it has entered an alarm state. LCD screen display instructions: ‘Err’ on the LCD to indicate the unit is malfunctioning. ‘Lb’ on the LCD to indicate it low battery and need replacement. ‘999ppm” on the LCD to indicate CO level over 999ppm. If the CO leakage is less than 999ppm but over 30ppm, it would show its actual concentration. LED status description： Green LED: The green LED flashes every 15 seconds to indicate the unit is operating properly. Red LED: When a dangerous level of carbon monoxide is detected the red LED will flashes and the alarm pattern will sound. What To Do IF The Alarm Sounds If alarm sounds: 1. Call your emergency services. 2. Immediately move to fresh air – outdoors or by an open door/ window. Do a head count to check that all persons are accounted for. Never restart the source of a CO problem until it has been fixed. Note: 1. Don’t press test/reset button while installing batteries. Otherwise, the unit will not work. 2.The unit needs to be tested weekly. Verify the unit’s alarm and LED light operation by pushing the test button once a week. Package included: 2x Alarms 4x Screws 1 x User Manual