LCD CO Carbon Monoxide Sensors & Alarm coolperfume Shipping Method: Ground

Shipping Method: Ground

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LCD CO Carbon Monoxide Sensors & Alarm coolperfume Shipping Method: GroundLCD displayer with a blue back ground light. . Loud 85 db alarm. . Permanent carbon monoxide sensor. . Powered by 3*1. 5V AA batteries ( not included in package) . The alarm sound pattern is four short alarm beeps. The red LED will flash whilte in alarm mode, . One" chirp" every 30 seconds is an indication that the battery is low ( need replacement) ( gree LED still flashes once every 30 seconds) or the unit is malfunctioning ( green LED is out). .