Large digital display is easy to read, even in low-light conditions
Peak-level memory displays the highest CO concentration measured since the last reset
Meets the requirements of Underwriters Laboratories (UL)

Voice alarm, announces hazard type detected helping to speed up correct reaction to hazard detected
Combined carbon monoxide and smoke alarm, single unit can be installed instead of two, reducing installation time
Test reset button tests alarm circuitry and triggers voice announcement, flashing green and flashing red LEDs