The First Alert SC5 Hardwire Smart Smoke & Carbon Monoxide Alarm, SMCO600NV-AC, is a hardwired detection unit designed for residential safety. It combines photoelectric smoke sensing with electrochemical carbon monoxide detection in a single device, providing dual hazard awareness. The unit features a fixed 120V AC hardwire connection, eliminating the need for battery changes during normal operation, though a backup battery is included for power outages. Its smoke sensor responds to smoldering and fast-flaming fires, while the CO sensor tracks harmful gas levels, triggering a loud 85-decibel alarm when thresholds are exceeded. The SC5 includes a voice alert system that verbally identifies the type and location of danger, which reduces confusion during emergencies. It also communicates wirelessly with other compatible First Alert alarms in a home network, enabling simultaneous activation across multiple units. The device is constructed from fire-retardant plastics and uses tamper-resistant mounting hardware to ensure stable installation. Its sleek white housing fits standard junction boxes and blends with most ceiling or wall finishes. The unit integrates with smart home ecosystems via the First Alert app, allowing remote status checks and notifications directly to a smartphone. When connected to Wi-Fi, it can send alerts even when the user is away, providing peace of mind. The alarm also supports voice assistant integration for hands-free updates. The hardwire design ensures constant power without frequent battery maintenance, reducing long-term operational effort. The sensor array is designed for low misfiring rates, minimizing false alarms from cooking or steam. The backup battery compartment is accessible without removing the entire unit, simplifying maintenance. The alarm meets Underwriters Laboratories (UL) standards for both smoke and CO detection, ensuring regulatory compliance. Its lifespan is typically up to ten years after installation, after which the entire unit should be replaced as indicated by the end‑of‑life chirp. The device is priced very affordably relative to comparable smart combination alarms, offering solid build quality and reliable performance without premium cost. The hardwire compatibility makes it suitable for new construction or retrofit replacements in homes with existing 120V wiring. It is ideal for homeowners seeking a dependable dual‑sensor alarm with smart features but at a reasonable budget. The voice alerts and app connectivity add convenience without complicating the core safety function. The unit’s robust enclosure and tested sensor accuracy contribute to long‑term dependability. For those looking to upgrade basic smoke detectors to a smarter system, this model provides a straightforward and cost‑effective solution. The lack of disposable batteries for primary operation further reduces ongoing expenses.

It represents a very economical choice for enhanced home safety.