HEIMAN Low-Level Carbon Monoxide Detector with Mini Digital Display, Battery-Powered

HEIMAN’s residential carbon monoxide alarm is designed to monitor CO and show live readings on its digital display across a 20–999 ppm measuring range.

• UL 2034 5th Edition certified and CSFM approved — meets stated residential alarm standards and approval requirements.
• 30 ppm early warning, 85 dB danger alarm, and 12-hour alarm memory — helps distinguish low-level buildup and retain notice of a missed event.
• Powered by two replaceable AA batteries — operates without a wall outlet or household wiring.
• Tabletop or wall-mount setup with installation hardware included — suits flat-surface placement or wall installation without wiring.
• Compact size of 4.09 x 2.89 x 1.43 in (10.39 x 7.34 x 3.63 cm) and weight of 4.37 oz (123.9 g) — easy to move between suitable locations.
• Detects carbon monoxide from fuel-burning sources — made for residential spaces such as bedrooms, hallways, living rooms, and basements.

Carbon monoxide can come from a range of fuel-burning equipment and appliances. This alarm is made for residential use in homes and rental properties, and its compact design also makes it convenient to take to hotels, vacation rentals, RVs, and cabins. Use it within its stated operating temperature range and choose a location away from vehicle exhaust.

How does the HEIMAN alarm warn about carbon monoxide?

The alarm uses staged alerts, including a 30 ppm early warning for slow, low-level CO buildup and a loud 85 dB alarm for danger. Its display presents live readings, while the 12-hour alarm memory can indicate a CO event that occurred while you were away.

The detector responds to carbon monoxide from gas furnaces, water heaters, fireplaces, car exhaust, clothes dryers, and kitchen stoves. This gives residents a way to monitor for CO from different fuel-burning sources rather than only one appliance type.

• Live readings begin at 20 ppm.
• Alarm memory covers a 12-hour period.

How is the HEIMAN carbon monoxide alarm powered and installed?

It runs on two replaceable AA batteries and does not plug into an outlet or connect to household wiring. Set it on a flat surface for use, or mount it on a wall using the included hardware kit; no electrician is needed for either setup.

After the batteries are inserted, the alarm powers on automatically following a 100-second warm-up. A built-in safety lock keeps the battery cover from closing if the batteries have not been installed. Replace the batteries when the low-battery warning sounds to keep the alarm operating.

• Suitable for tabletop or wall-mounted placement.
• Operating temperature: 40°F to 100°F (4.4°C to 37.8°C); performance may be compromised outside this range.

Where can I use the HEIMAN alarm?

It is intended for residential locations such as bedrooms, hallways, living rooms, family rooms, basements, and other suitable areas, including placement on each floor of a home. Its dimensions and weight make it portable for trips to hotels, vacation rentals, RVs, and cabins.

The alarm is UL 2034 5th Edition certified and CSFM approved for residential carbon monoxide alarm applications, with compliance to NFPA installation codes. It is not designed for garages, workshops, or placement directly under vehicle mufflers or exhaust pipes; keep it within the stated operating temperature range.

• Made for homes, rental properties, and other residential spaces.
• Keep away from garages, workshops, and direct vehicle exhaust.

How do I test or silence the HEIMAN alarm?

Use the single Test/Hush button for a quick weekly self-test or to silence specified alerts. Hushing does not stop CO monitoring.

The button can silence nuisance CO alarms for 4 minutes, low-battery chirps for 12 hours, and end-of-life alerts for 48 hours. A weekly test gives you a simple way to check that the alarm is operating.

• One button handles testing and hush functions.
• CO monitoring continues while an alert is silenced.

This HEIMAN alarm suits people who want battery-powered residential CO monitoring, visible readings, and flexible tabletop or wall placement in one compact unit. Its live display, staged alerts, and portable design make it a practical fit for suitable home locations and travel stays.