It is a perfect item for protecting your family from the danger of carbon monoxide and very easy to read with the digital display, even in a low light condition. Features: 1. Test/Reset button to test the unit electronics and verifies proper unit operation and reset the unit during CO alarm 2. Alarm memory feature: If the unit ever alarms, pressing the button, green LED will flashes once every second for one minute and the peak alarm level will be indicated on the LCD 3. Green and red LED lights that indicate normal operation and alarm status 4. The unit will sound chirp and red LED flashes once as power up 5. Green LED Flashes every 30 seconds to indicate the unit is operating properly. The green LED will also flash before CO reading is taken and when any button is pressed 6. Red LED When a dangerous level of carbon monoxide is detected the red LED will pulse and a loud alarm pattern will sound. Specifications: Brand: Floureon Color: White Sensitivity & Time: 30ppm, Alarms within 120 Minutes 50ppm, Alarms within 60~90 Minutes 100ppm, Alarm within 10~40 Minute s 300ppm, Alarms within 3 Minutes Standby Current: Package Content: 2x Carbon Monoxide Alarm