Co (carbon monoxide) is a colorless, odorless and tasteless poisonous gas that can be fatal when inhaled, which is also know as “silent killer.” it is produced when any fuel is incompletely burned because of insufficient oxygen. Wood fires and charcoal grills produce large amounts of co. Malfunctioning heating systems also produce co. It’s highly suggest to install co detectors in place like kitchen, bathroom, living room, car barn. Co-01a from ansee is a co detector that can work standalone or work with alarm host remotely. It adopts lower power consumption microcontroller and high performance electrochemical sensor, with features such as stable, reliable, accuracy, long standby time etc. It can help you protect your home and family from co threats, even when they occur in remote areas of the home or at night when everyone is asleep. The detector will make “di-di-di” sound, and the red led flash fast when alarm occurs, meanwhile the co concentration appears on the lcd. The green led flash 1 times every 30 seconds when it’s under working state. It also has reset and test function. This co detector has low voltage alarm and test function. Press the test button for several seconds, the detector will make alarm sound and the red led will flash fast, meantime the lcd will playback the alarm record circularly with maximum 10 records.