SMCO600NV — First Alert SC5 Wireless Smart Smoke & Carbon Monoxide Alarm, a fully battery-powered combination smoke and CO alarm with voice alerts and wireless interconnect through the First Alert by Resideo app.
This is the battery version of the SC5. It has no AC connection: it is powered entirely by six 3V CR123A batteries and therefore continues to operate during a power outage, but it also cannot operate at all without working batteries. Because there is no interconnect wire, alarms are linked to one another wirelessly through the First Alert by Resideo app rather than through junction box wiring, which makes it suitable for retrofits where no interconnect conductor exists. Setup is started in the app before the alarm is mounted. Voice alerts announce the type of danger and the programmed location.
Specifications
| Model |
SMCO600NV (SC5 Wireless) |
| Detection |
Combination smoke and carbon monoxide |
| Power source |
Six (6) 3V CR123A batteries (Duracell 123, Energizer 123 or Huiderui) |
| Interconnect |
Wireless, through the First Alert by Resideo app |
| Wireless frequency |
2.4GHz and 5GHz; 802.11 b/g/n/ac router recommended |
| End-of-life signal |
Audible signal approximately 10 years after installation |
| Approved use |
Single-family residences; not designed for marine or RV use |
| Sensors | Photoelectric smoke; electrochemical CO |
| Sound level | 85 dB at 10 feet |
| Dimensions | 5.75 in x 5.75 in x 1.6 in |
| Weight | 1 lb |
| Standard | Conforms to UL 217 10th Edition |
| Warranty | 10 Years Limited |
Installation notes
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Battery power is the only power: removing the batteries for any reason, or failing to replace them at end of service life, removes your protection entirely. There is no AC feed to fall back on.
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Set up before mounting: begin setup in the First Alert by Resideo app before the alarm is mounted.
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Wireless interconnect needs range testing: install the alarms and test to confirm range and reliability of interconnection throughout the house. Floors, room count and size, furniture, building materials, suspended ceilings, ductwork, large metal appliances and metal studs can all reduce range; adding more alarms can route signals around obstructions.
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Mixed AC and DC systems: if both AC and DC devices are present, press and release the test button on the AC device to test the interconnect feature across all devices.
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Smart Interconnect scope: wireless Smart Interconnect works with other First Alert and BRK SC5 wireless smoke and CO alarms and with Google Nest Protect alarms. Alarms without the Smart Interconnect feature will remain silent during a CO alarm.
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Initiating alarm identification: only the initiating alarm blinks its red LED halo; interconnected units sound but do not blink red.
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Never remove batteries to stop a nuisance alarm: use the silence button and ventilate the area instead.
Related models
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SMCO600NV-AC — the hardwired SC5. It runs from a 24-hour 120VAC pure sine wave 60Hz circuit with battery back-up and interconnects over an orange interconnect wire, with a limit of 18 compatible units and under 1000 ft of interconnect wire. None of those wiring limits apply to this battery model.
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Google Nest Protect — listed in the manual as compatible with this alarm’s wireless Smart Interconnect.
Specifications taken from the First Alert / Resideo data sheet "SC5 Wireless Smart Smoke & Carbon Monoxide Alarm SMCO600NV Installation & Reference Manual," document M08-0785-000 Rev A (5/25). Manufacturer specifications are subject to change without notice.
Documents
FAQ
Does the SMCO600NV need hardwiring?
No. It is powered entirely by six 3V CR123A batteries and has no AC connection. The SMCO600NV-AC is the hardwired 120 VAC version with battery back-up.
How do the alarms interconnect?
Wirelessly, through the First Alert by Resideo app. Smart Interconnect works with other First Alert and BRK SC5 wireless smoke and CO alarms and with Google Nest Protect.
What Wi-Fi does it need?
It works on 2.4 GHz and 5 GHz networks; an 802.11 b/g/n/ac router is recommended. Start setup in the app before mounting the alarm.
When does the alarm need replacing?
It sounds an end-of-life signal approximately 10 years after installation. It is approved for single-family residences, not for marine or RV use.
