1 pack digital carbon monoxide (CO) detector alarm, battery powered

Features: Sensitivity/Alarm Time: Within 60 to 90 minutes at a CO concentration of 50 ppm; Within 10 to 40 minutes at a CO concentration of 100 ppm; Within 3 minutes at a CO concentration of 300 ppm. LCD screen (optional): 4-digit LCD screen. Audibility: 85 dB (at 1 m distance), frequency 3 - 0.5 kHz. Standby current: < 50 A. Alarm current: < 50 mA. Standby mode: Green LED flashes once every 30 seconds. Alarm mode: Red LED flashes rapidly 4 times with a beep every 5 seconds, then repeats. Low battery indicator: Beeps every 30 seconds when the battery is below 3.3 V with the green LED flashing and "Lb" displayed on the LCD screen. Malfunction indicator: Beeps every 30 seconds with the green LED off and "Err" displayed on the LCD screen. Power consumption: 0.3 mW. Size: 11 x 4 cm. Powered by: 3 x AA batteries (not included). A perfect item to protect your family from the dangers of carbon monoxide. Advanced protection level, easy to read. Digital display, even in low-light conditions. Displays the carbon monoxide level detected by the device. Green LED: Flashes every 30 seconds to indicate that the device is functioning correctly. The green LED also flashes before a CO measurement is taken and when a button is pressed. Red LED: When a dangerous level of carbon monoxide is detected, the red LED flashes and an audible alarm sounds. The carbon monoxide alarm pattern is 4 short beeps, followed by 5 seconds of silence, followed by 4 short beeps with a corresponding flashing red LED. This cycle will continue for 4 minutes, then switch to 1 cycle every minute until the device is reset or the CO is eliminated. The Test/Reset button is designed for weekly testing to ensure proper operation and to reset the device during a CO alarm. Alerts users when the batteries need replacing. Mounting this alarm on a wall surface is highly recommended. Compact, lightweight, and easy to use. Specifications: Color: White Sensor: Electrochemical CO sensor Package contents: 1 x Carbon Monoxide (CO) alarm Battery not included