9 volt battery backup (included): continues measuring CO levels even during a power outage. AC plug with bonus hide-a-way cord: allows direct or remote plug-in. Digital readout of CO level: continuous readout of measured CO values from 30-999 ppm. Peak level memory and display: recalls and displays highest measured CO level. Test/reset button: tests units electronics and silences alarms. Loud 85 decibel alarm.
Loud voice alarm indicator: voice alarm announces Fire Fire or Warning carbon monoxide warnings. Smoke fire and CO protection: combines two important types of safety alarms in one unit. Smart hush: newly developed hush feature. Provides voice Hush activated and Hush cancelled indication. Automatically deactivates when nuisance smoke clears. Test/reset button: single button easily tests smoke and CO sensors simultaneously. Low battery indicator: unit announces Low battery and red LED flashes. Intelligent interconnect: only unit to interconnect with other safety devices and distinguishes between smoke and CO alarm signals. 120 V AC direct wire with 9 V battery backup