This gas detector with external CO sensor, which has been subjected to a full test in accordance with DIN EN 50291 at the TUV Sued, is an indispensable safety device in any household!In case of an alarm, the connected device is switched off and an additional audio and visual message is triggered. The system starts immediately at a carbon monoxide concentration of 300 ppm. Lower concentrations will trigger the alarm only after a certain waiting time specified by the standard. On the one hand, this reliably prevents false alarms, and on the other hand it also gives you an alarm if lower concentrations over time can lead to an accumulation in the blood.This text is machine translated.