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Keep your family safe with this easy to use plug in carbon monoxide alarm; It works with any standard outlet and also has a battery backup for continuous monitoring of Carbon Monoxide levels, even if there's a power failure

Features an advanced electrochemical carbon monoxide sensor that accurately detects carbon monoxide levels, no matter where the detector is placed in the room

Simple to use, with a single test/silence button; a loud 85 decibel alarm sounds when Carbon Monoxide levels reach dangerous levels. Low battery signal mute, quiets low battery signal for upto 8 hours

To ensure complete protection make sure to place one on each level of your home and in each bedroom

7 year limited warranty; Equipped with end of life signal chirp, so you know when it’s time to replace the unit for safety

All first alert CO alarms are rigorously tested to meet UL standards. Item length is 3.4 inches , item width is 1.38 inches and item height is 5 inches

Loud 85-decibel alarm sounds when CO levels are elevated

3 in 1 Detectors - Our Carbon Monoxide Detectors plug in can not only Monitor Carbon Monoxide, but also Monitor the Temperature and Humidity of the Surrounding Environment, so that You Know Clear the Condition of the Surrounding Environment.

Professional CO Gas Sensor - Using Highly Sensitive Electrochemical Sensors, 0-1000PPM, Quick Response, Fast Alarm. 

Voice & Light Alarm - When the Gas Concentration Exceeds the Standard, the Intelligent CO Detector can Quickly Recognize and Issue an Alarm of 85dB or Above, Allowing you to Detect and Make the Right Choice in a Timely Manner.

Easy to Install - Plug in Carbon Monoxide Detector, Plug and Play, Saving Installation Time.

Widely Used - 3 in 1 Travel Carbon Monoxide Detector are Suitable for Bedroom, Kitchen, Living Room, Bathroom, Apartment, Garage, Office, Restaurant, Hotel, etc.

Worry-Free After Service - We are willing to provide you with unconditional returns and exchanges within 90 days. If you have any questions, please contact us by email, we will try our best to help you solve the problem.

4 in 1 Carbon Monoxide Monitor - Detects carbon monoxide (0-999 PPM), Natural Gas Detector(Lv1 - Lv4), temperature (14-122℉), and humidity (0-95% RH)

Loud & Accurate Alarm – Uses a high-sensitivity electrochemical sensor. When CO levels exceed 150 PPM, it triggers a sound and light alarm with a loud 85 dB alert.

Plug & Play – No installation required, simply plug it in and start using.

Compact & Clear Display – LCD screen provides clear, high-definition readings, even in low-light conditions.

Wide Application – Suitable for bedrooms, kitchens, living rooms, bathrooms, apartments, garages, offices, restaurants, hotels, RVs, Yacht and more.

Two Sensors: Carbon monoxide detector smoke alarm has a 2-in-1 dual sensors, photoelectrical and electrochemical sensors. They work separately, no matter which one reaches their dangerous concentraion, combination smoke carbon monoxide alarm detector will go off with red led flashing

Readable Digital Display:The screen of smoke detector carbon monoxide detector combo will display the CO or smoke concentration and illuminate when it goes off. This smoke detector has a standby mode, its screen will not be on and no need to worry about being disturbed under a standby mode. Under a standby mode, green led blinks about every 60s

Loud Beep: This combination smoke carbon monoxide alarm detector has a louder than 85 decibels beep with red LED flashing. It is loud enough to let you know the danger and take ation to avoid it quickly. It is recommended to install more than one in your house for a maximum protection

Red or Green Led function: This smoke alarm and carbon monoxide detector has a low battery warning, it will go off and blink red led. When dangerous concentration happens,it also goes off and blinks red led. Green led with beep is for test button to detect this fire detector and carbon monoxide detector's different working status

Green Led Too Bright? : If you feel that the green led is too bright, it is recommended to cover with a transparent pvc until you feel good. This smoke detector is wireless, easy installation. Both wall and ceiling are suitable for installation

10-Year Lifespan: Protect your loved ones from the silent threat of carbon monoxide for an entire decade with this reliable 10-year CO sensor; powered by replaceable AA batteries that last 3 years

Travel-Friendly Design: Slip this compact CO detector into your bag or suitcase for extra peace of mind when you travel; measuring only 3.0 × 5.6 × 1.3 in (75 × 142 × 32 mm) and using AA batteries, this convenient device can be taken in carry-on or on trips abroad

Versatile Placement Options: This CO detector's flexible design allows you to place it on any flat surface, such as a desk, bookshelf, or bedside table; screws are also included to mount it on the wall

Intuitive to Use: Easily use this alarm even in urgent situations thanks to its simple, size-differentiated buttons; enjoy reliable access to critical functions like checking the peak CO levels or testing/silencing the alarm

Easy to Understand: See the current CO level on a clear display; a tri-color LED tells you the alarm’s status at a glance: red for alarm, yellow for fault or low battery, and green for working normally

【3in1 CO detectors】carbon monoxide, humidty and temperature monitors all Integrated in 3.5x2.2x 0.66inches mini size detetor body, real time tracking the concentration of harmful gases; humidity; temperature and make them show on the HD screen.

【New Electrochemical sensor upgraded】Built-in new upgraded sensor makes it more accurated and longlasting detect carbon monoxide. CO range: 0 to 1000PPM; Humidity range: 0% to 95%RH; Temperature range: 14 to 140 ℉. The cycle alarm works when the CO is over 50ppm: 50-100ppm: 3 times alert in 3 mins, 101-200ppm: 5 times alert in 5 mins, 200ppm upper: continuously alert.

【Longer battery life with new power-saved mode】Built-in 1000 mAh lion battery which provides longest 72 hours life with power-saved mode: Screen auto sleep after 30s, the CO detector will go into low power operating mode.(CO monitor sitll continuesly working when screen off.)

【Portable Design CO detector】 Our 3in1 detetors come with lanyard and design with kickstand & Screw buckle hole. We can hang it , fixing it to wall or keep it stand anywhere, perfect for outdoor & indoor activities, camping tents, boats, aircraft, stove heating, RV car, hotel, kitchen, bedroom, living room and other confined spaces.

【How to test it ?】 Carbon monoxide is generated in incomplete combustion and dense smoke. We can take it close to a cigarette or burning paper that produces thick smoke. The CO concentration will change and show on the screen. Don't test it by car exhaust or airy place, too low CO consentration can't not trigger sensor to work.

【4in1 CO & Natural gas detectors】Our Gedsffati newest combination 4in1 detectors Integrated carbon monoxide, Combustible gas( like natural gas, propane, methane, natural gas, coal gas, gasoline, Hexane, butane, benzene, ethyene oxide, acetylene, LPG, LNG, etc),temperature and humidity sensors, real time to detector the environment gas safety for us.

【Plug in & Play design】US standard plug is compatible with 110V to 220V AC outlet. Fits all US standard AC outlet in bedroom, kitchen, living-room, basement, hotel room, etc. Just Plug in and the detector will real-time work all day.

【Built-in 2000 mAh emergency Blackup battery】Provides 18-20h working time, helps to cope with sudden power outages. Rechargable lithium battery design, Compared to other disposable batteries, we can help you save a lot of battery replacement costs.

【2.1’’ HD Screen】 All the datas real times and dynamically show on the HD screen, we can read the data faster from the big icons like: CO ppm,Combustible gas warning icon, humidity, temperature, CO indicator icon, plug and alarm status.

【All gas environment safety we care for you】 Built-in UL2034,UL1484 standard independent CO / Combustible gas sensor, HD screen visible and 85 dB audible design is real time detect the gas environment, bring you extra safety for you and family.

Upgraded 4-in-1 Detector: This advanced Natural Gas and Carbon Monoxide Detector combines sensors for natural gas, carbon monoxide, temperature, and humidity. Featuring robust performance, dual sensors, a dual alarm system, and fast response, it offers all-around protection to ensure the safety of your household.

Quick Response & Dual Alert System: This RV carbon monoxide detector is equipped with both visual and audible alarms. When gas levels become dangerous (CO ≥ 150 PPM, natural gas ≥ 5% LEL), the red light flashes repeatedly, accompanied by a loud alarm (≥ 85 dB). This immediate notification enables you and your family to quickly detect threats, providing essential protection for your safety.

Eco-Friendly & Energy-Efficient Design: This plug-in carbon monoxide detector is compatible with AC 110V~220V and operates with a low standby power consumption of ≤ 2W, making it highly energy-efficient. Its durable electronic sensor has a long lifespan, reducing the need for frequent replacements and offering an environmentally friendly solution.

LCD Display & Versatile Use: This RV carbon monoxide and propane detector features a clear LCD color screen, displaying precise readings for carbon monoxide (0-2000 PPM) and natural gas (0-10% LEL) levels. Its compact size saves space, making it ideal for various settings such as homes, hotels, RVs, and cruise ships.

Important Usage Notes: Before using, please remove the protective film. After plugging in, allow 180 seconds for the detector to adjust to its environment. Press the self-test button to trigger the alarm. Additionally, as the device may generate heat after powering on, wait 30 minutes for more accurate humidity and temperature readings.

Carbon Monoxide Detector: The DS-399 Portable Carbon Monoxide Detector can detect CO levels ranging from 0 to 1000 PPM. It also allows you to set custom alarm thresholds for even earlier detection, ensuring your safety. In addition, the CO meter monitors real-time temperature and humidity, providing you with accurate environmental data

Powerful Rechargeable Battery: Featuring a powerful 1000mAh lithium battery, this CO alarm is equipped with Type-C charging capability, ensuring minimal downtime. A full charge provides up to 168 hours of continuous use, making it a reliable choice for long trips and extended outdoor stays

Easy to Carry: This handheld CO tester is designed to be extremely compact, roughly the size of your palm. Its small size makes it easy to carry, whether tucked in your pocket or attached to your luggage using the included lanyard. Its portability ensures that safety is always within reach during your travels

Audio-visual Alarm: The detector allows you to set custom CO alarm thresholds. When the gas concentration exceeds the set alarm threshold, the device emits an audible alarm, and the ring indicator light below the screen changes color based on the alert level. This dual alert system provides double protection for your safety

What You Get: You will receive DS-399 Carbon Monoxide Detector, Type - C Cable, Lanyard, User Manual

High Sensitivity Sensors-Our carbon monoxide detector is equipped with a high-precision electrochemical CO sensor, which can detect carbon monoxide levels quickly and accurately.The moment the CO concentration breaches the safe threshold, a blaring 85+ DB alarm rings out, giving you precious seconds to act and safeguarding your loved ones and home from potential harm.

User-Friendly-The LCD screen of this carbon monoxide alarm displays the carbon monoxide value prominently and intuitively.LED indicates status of the CO detector. Test-Hush Button makes testing the detector or silencing false alarms easy,even the elderly and children can operate it with ease.

Easy to install-The CO alarm Powered by 2xAAA batteries. Say goodbye to the hassle of wiring and the dread of power outages. You can set it up in minutes, whether it's on a bedroom wall, kitchen ceiling, or anywhere you need protection. No need to call in the professionals or worry about power cords – it's truly effortless to install and maintain. (Batteries not included)

Compact and portable-This travel carbon monoxide detector is compact and lightweight, and it can be easily packed into luggage. Whether you're staying in a hotel or traveling in an RV, it can provide reliable carbon monoxide protection at any time and anywhere.

Quality Assurance-All carbon monoxide alarms have been rigorously tested,and meet UL standards. If you have any questions about our CO detectors, please feel free to contact us.