The Kidde K10LLDCO carbon monoxide detector with a built-in LCD display shows CO concentration ranging from 0 to 999 PPM. Thanks to its built-in battery power, the detector can be installed in an optimal location without dependency on mains voltage.

Exceeding the maximum allowed CO level is signaled visually (red LED) and acoustically (loud pulsing alarm at 85dB). The test/reset button allows functionality checks and alarm deactivation. Another button displays the highest detected CO level stored in the detector's memory.

The integrated control system ensures continuous monitoring of the sensor, internal circuits, and battery condition. In case of malfunction or low battery, a yellow LED blinks and the display shows relevant graphical information accompanied by an acoustic warning signal.