Device page by an independent Vivint Authorized Dealer
Vivint Smoke and CO Detector: Price, Monitoring and Code Rules
Vivint's smoke detector (model SMKT3) is a photoelectric detector with a heat sensor that trips at 135°F or a 15°F-per-minute rise, costs $100, and runs on 3 AAA batteries; the combination unit (SMKCO1) adds an electrochemical carbon monoxide sensor, runs 5 years on 2 CR123A cells, and carries 10-year sensor life. Both sound an 85 dB siren and dispatch the fire department through the monitoring centre. This page covers the price, 7 specifications, monitored versus standard detectors, code placement rules, and testing.
Prices and terms verified October 7, 2026. Vivint sets all prices; dealer promotions are listed separately.
What It Does
A Vivint detector does 3 things a standard detector does not: it sounds the hub siren and every other Vivint detector in the house, it sends the alarm to the monitoring centre for fire dispatch whether anyone is home or not, and it reports its battery and sensor age to the app.
Price and Specifications
The 7 specifications come from Vivint's SMKT3 and SMKCO1 support sheets.
| Attribute | Smoke (SMKT3) | Smoke + CO (SMKCO1) |
|---|---|---|
| Smoke sensing | Photoelectric | Photoelectric |
| Heat | 135°F fixed or 15°F/min rise | Yes |
| CO sensing | No | Electrochemical |
| Siren | 85 dB minimum | 85 dB minimum |
| Battery | 3 AAA | 2 CR123A, 5 years |
| Sensor life | 10 years | 10 years |
| Price | $100 | $100 |
Monitored vs Standard Detector
A standard detector wakes the people in the house; a monitored one also sends the fire department when nobody is home, which is when most total-loss fires happen. Photoelectric sensing responds faster to smouldering fires and slower to flaming ones, which is why the heat sensor is included.
Code Requirements by Location
Building codes (NFPA 72 as adopted by states) require a smoke alarm inside every bedroom, outside each sleeping area, and on every level including the basement; CO alarms are required outside sleeping areas in homes with fuel-burning appliances or attached garages in most states. Vivint installs its detectors as monitored additions and will not install in commercial properties, churches, or daycares.
Permit rules by state are on the service areas pages.
Battery and Testing
Test monthly with the test button, replace AAA cells when the app warns, and replace the whole unit at the 10-year sensor date the app tracks; CO sensors degrade on a fixed schedule regardless of use.
Frequently Asked Questions
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