This is a 3-in-1 plug-in monitor that displays three live readings on a single color screen: carbon monoxide (CO) levels in PPM, ambient temperature, and relative humidity. Unlike traditional CO alarms — which simply make noise when CO reaches dangerous levels — this device shows you the actual numbers on screen at all times. You can watch CO rise from low levels long before any alarm threshold is reached.

The audible 85 dB alarm activates when CO concentration reaches 50 PPM. At that point, the screen also flashes a yellow warning icon and the breathing light pulses — a combined visual + audible alert. We're upfront about the threshold because we believe in transparency. The number printed in the manual matches the number listed on this page.

Yes — this is the core feature of the product. The screen continuously displays the actual CO level in your air, in PPM. Even at 5, 10, or 20 PPM (levels at which no traditional alarm would ever sound), you can see the number on the display and act accordingly. Most home CO alarms are legally prohibited from alarming below 30 PPM under the UL 2034 safety standard — this monitor lets you see what's happening in your air long before any alarm could.

The unit displays real-time digital readouts of CO, temperature, and humidity. It uses a CO sensor designed for residential air quality monitoring. For industrial-grade calibration with NIST traceability, professional gas detection equipment is available at significantly higher cost — but for everyday home, travel, and family safety use, this monitor provides exactly what most homes have never had: a live PPM number on a screen.

The device includes a fault indicator light that signals if the sensor encounters a problem. Most traditional alarms have no way to tell you if the internal sensor has degraded — the green "power" light stays on even when the sensor is dead. This monitor includes a dedicated fault indicator specifically to address that issue.

You can also press the test button at any time to verify the alarm function is operational.

If your local building code requires a specific UL 2034-listed alarm in your home, check your local requirements first. Many customers use this monitor alongside their code-required alarm — the traditional alarm covers the regulatory requirement, while this monitor provides the visibility and early warning that traditional alarms don't offer.

It takes about 30 seconds. Plug it into any standard 110V–220V wall outlet. The device powers on immediately and begins monitoring. There's no wiring, no batteries to install, no app to set up, no drilling, and no ladder required.

Common placement recommendations from CO safety guidelines:

• Within 10–15 feet of every sleeping area
• On every floor of the home
• Near attached garages
• Near fuel-burning appliances (furnaces, water heaters, fireplaces)

For maximum safety, the CDC and NFPA recommend placing detectors on every level of your home, including basements.

Yes. You can switch off the screen, the breathing light, or both — useful for keeping bedrooms dark while you sleep. The device continues monitoring CO 24/7 even with the display off, and the full alarm system activates immediately if CO reaches 50 PPM.

Long-press the test button on the front of the device to toggle between °F and °C.

The audible alarm is rated at 85 decibels — comparable to heavy city traffic. It's loud enough to hear from another room and to wake most adults from deep sleep. Combined with the flashing screen and pulsing breathing light, it's a multi-sensory alert.

A traditional CO alarm is built to a federal life-safety standard (UL 2034) designed only to prevent acute, immediate emergencies. By design, those alarms remain silent at lower exposure levels and may delay alarming at 70 PPM for up to 4 hours.

This monitor is different in three key ways:

1. It shows you the actual CO number on a live screen, all the time
2. It alarms earlier — at 50 PPM rather than waiting up to 4 hours at 70 PPM
3. It monitors three readings (CO, temperature, humidity) rather than just CO

The traditional alarm tells you when to evacuate. This monitor tells you what's actually happening in your air every minute of every day.

UL 2034, the standard most home CO alarms are built to, was designed specifically to prevent "nuisance alarms" from minor exhaust events. To meet the standard, alarms are engineered to ignore low-level CO entirely. Most manufacturers don't include real-time displays because they aren't required for code compliance — and adding them increases manufacturing cost.

Yes — and it's more common than most homeowners realize. Common sources include:

• Aging furnaces (cracked heat exchangers)
• Blocked or damaged chimney flues
• Gas water heaters and gas stoves
• Attached garages with running vehicles
• Wood-burning fireplaces

The CDC reports over 400 unintentional CO deaths annually in the US, plus more than 100,000 emergency room visits — many from chronic, low-level exposure that builds up over time.

Yes. The device runs on any standard 110V–220V outlet. Its compact size makes it ideal for travel — many customers keep one at home and one in their suitcase. RVs, Airbnbs, hotels, vacation rentals, and small cabins are all common use cases.

Yes — it's designed for continuous monitoring. The device is built to run 24 hours a day, every day, drawing minimal power from your wall outlet. The continuous monitoring is the whole point.

Sensors: Carbon monoxide, temperature, humidity

Power: 110V–220V standard wall outlet (plug-in)

CO measurement range: 0–999 PPM

Alarm threshold: 50 PPM

Alarm volume: 85 decibels

Display: Color LCD with three simultaneous readings

Indicator lights: Power (green), Alarm (red), Fault (yellow), breathing light (white)

Form factor: Compact, plug-in, ~deck-of-cards size

Operating temperature: Standard residential range

Orders are processed within 1–2 business days. Standard delivery within the US takes 3–7 business days. International shipping is available with delivery times varying by destination. You'll receive a tracking number as soon as your order ships.

We offer a 3-Year money-back guarantee. If you're not satisfied for any reason, contact us at info@try-volt.com to start a return. We'll refund your full purchase price — no restocking fees.