The combination smoke and carbon monoxide alarm shall be a BRK model SC9126BTCA and shall provide at a minimum the following features and functions: An Ionization smoke sensing chamber. An electrochemical CO sensing chamber. The unit shall be capable of self restoring. Fully screened sensing chamber to resist entry of small insects thereby reducing the probability of unwanted alarms. Powered by 120 V AC, 60 Hz with 9 V battery backup and a solid state piezo horn rated at 85 dB at 10 ft. A visual green LED power-on indicator to confirm unit is receiving power or is in alarm. A full function test button should check all alarm functions by simulating a smoke and then co condition, causing the unit to alarm with condition specific alarm patterns. Two silence features - temporarily silence unwanted nuisance alarms and low battery. Two latching features: alarm latch to easily identify initiating alarm after alarm condition has subsided. Low battery latch: to visually identify which unit is in low battery condition.