Welcome to our store！</br>1、By measuring the carbon monoxide gas content and smoke concentration in the air, an alarm will be issued when the industry standard limit is reached. 2、Send out an audible and visual alarm greater than 85dB when alarming, push APP alarm information at the same time and dial the cloud alarm phone (the preset telephone number of the alarm receiver). 3、The cloud alarm log allows users to query historical alarms anytime and anywhere, more convenient to use, bring you more advantages. 4、Mainly used in homes, warehouses, enterprises, schools, hospitals, restaurants and other places that can cause gas leaks and fires. 5、2pcs CR123A lithium batteries are used, can maintain a standby time of two years and reduce the frequency of battery replacement. <p class="wang-edit-text"><p class="wang-edit-text"> <p class="wang-edit-text"> Item Type: Carbon Monoxide Alarm Material: ABS Battery Model: 2pcs CR123A + 1pc&nbsp;built-in lithium battery 1000mAh Alarm Concentration: 100PPM Standby Current: &lt;25uA Alarm Current: 50mA Working Environment: +5℃ to +40℃ Installation Method: Wall or ceiling <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 1 x Carbon Monoxide Alarm 2 x Screw&nbsp; 2 x Expansion Tube&nbsp; 1 x Manual&nbsp; Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>