Specifications: <br /><br />Color: white. <br /><br />Sensor: electrochemical co sensor. <br /><br />Alarm tone: 85 decibels <br /><br />Display: LCD digital display. <br /><br />Low power alarm: a "built" every 30 seconds is a clue. <br /><br />Power supply: 3 AA batteries (not included). <br /><br />Alarm standard: <br /><br />50ppm・ alert within 60 to 90 minutes; <br /><br />100ppm・ alert within 10 to 40 minutes; <br /><br />300ppm・ alert within 3 minutes. <br /><br />Note:<br /><br />1.This carbon monoxide alarm is designed to detect carbon monoxide gas. It is Not designed for Smoke detect and alarm or ANY GAS detect.<br /><br />2.Don't press test/reset button while installing batteries. Otherwise・ the unit will not work.<br /><br />3.The unit needs to be tested weekly. Verify the alarm and LED light operation by test the unit once a week.<br /><br />4.The lifetime of CO detector・ is depends on the sensor which build-in alarm. The lifetime of the sensor is depends on air humidit. If the alarm under a proper level of air humidit・ the lifetime of alarm would be 1 year. Otherwise・ it would not live more than 1 year.<br /><br />5.This CO alarm is with 3 AA Alkaline batteries. The lifetime of batteries would be 1 year or more than 1 year when under standby mode. The lifetime of batteries would be less than 1 year if you press the test botton often or the detector alarm often.<br /><br />Package Included: <br /><br />2 x Carbon Monoxide Alarm