Heiman Carbon Monoxide Detectors, Low-Level Mini Digital Display CO Alarm

UL 2034 5th Edition Certified, US Safety Compliant — Certified to UL 2034 requirements for residential carbon monoxide alarms. Designed to monitor carbon monoxide from common fuel-burning sources such as furnaces, water heaters, fireplaces, gas stoves, clothes dryers, portable generators, and vehicle exhaust. Follow the included installation instructions and applicable local requirements when selecting alarm locations.
2 AA Battery Powered — NOT a Plug-In Alarm — This carbon monoxide detector operates on 2 replaceable AA batteries and does not plug into a wall outlet or require household wiring. Battery operation allows flexible placement without depending on a nearby electrical outlet. Replace batteries when the low-battery warning sounds; battery replacement is required during the service life of the alarm.
Real-Time LCD Display + Graded Low Level CO Early Warning System — This carbon monoxide detector features a clear digital screen showing live CO readings starting at 20ppm (20–999ppm measuring range), so you can gauge hazard severity at a glance. The co alarm delivers multi-stage alert system: 30ppm early warning for slow low-level buildup, a loud 85dB danger alarm, and 12-hour alarm memory to alert you of missed CO events when you return home.
Tabletop or Wall-Mount Installation — No wiring or electrician needed for this co detector. Place directly on any flat surface for instant use, or wall-mount with the included full hardware kit. A built-in safety lock prevents forgotten AA battery installation — the cover won’t close without batteries inserted. It auto-powers on after a 100-second warm-up with zero extra setup.
Ultra-Compact & Portable for Home & Travel — Measuring just 4.09″ L × 2.89″ H × 1.43″ W and weighing only 4.37 oz, this lightweight CO detector is easy to place in bedrooms, hallways, living rooms, family rooms, basements, and other suitable areas throughout the home. Its compact design also makes it convenient to take along to hotels, vacation rentals, RVs, cabins, and more.
One-Touch Hush & Simple Weekly Self-Test — The single Test/Hush button silences nuisance CO alarms (4 minutes), low-battery chirps (12 hours) and end-of-life alerts (48 hours), while uninterrupted CO monitoring remains active. Use the button for quick weekly self-tests to confirm proper operation.