✨ Brand new, unopened. 【Perfect for Japanese Outdoors】Equipped with a high-precision sensor that can detect from 0PPM, it can measure stably even in the rainy and humid outdoor environment of Japan. The 3D multi-surface air intake amplifies the airflow, accurately capturing even the slightest changes in carbon monoxide concentration, and displaying it on the display in just 0.5 seconds. With a design that combines accuracy and speed, it protects you and your precious family from the dangers of carbon monoxide, which you can't see, hear, or smell. It is an essential safety item for camping, car camping, and as a precaution in the event of a disaster. 【Backlight color changes! Check the danger level at a glance】Not only numbers, but also the backlight color: Green (50-100PPM) → Yellow (101-200PPM) → Red (201PPM or more) changes to instantly determine safety, caution, and danger. It is a safe design that allows you to intuitively grasp the situation even in a dark tent or car. 【Large screen, large characters! Safe confirmation】2025 new design! The large screen and large characters make it even easier to understand changes in carbon monoxide concentration. Although the carbon monoxide checker is palm-sized, it is equipped with a large 4.1cm diameter LCD display (about 380% larger than other products), allowing you to clearly see the carbon monoxide concentration even from a slightly distant location. Especially dangerous CO concentrations are displayed most prominently on the screen, and temperature and humidity information can also be checked at the same time, making it safe in various environments such as tents and cars. 【85dB loud alarm + Japanese voice! Instant notification of danger】When the CO concentration or the time of occurrence exceeds a certain standard, a buzzer and voice announcement will prompt ventilation, preventing the risk of poisoning. Safe even while sleeping! The loud alarm notifies you of the danger of carbon monoxide without fail! 【Silent button design! Without disturbing the surroundings】In addition to sounding the alarm, it also has a silent function. If you want to temporarily stop the alarm when it sounds, you can press the mute button to temporarily stop the alarm! To ensure safety, the silent time is set to 5 minutes, during which time you need to ventilate and lower the concentration to a safe range. If the concentration does not return to a safe range after 5 minutes, the alarm will automatically sound again. With the silent design, the alarm will sound reliably when necessary and can be silenced when unnecessary, without disturbing the surroundings. 【Easy for anyone! Doesn't choose a place】No wiring required, just set the included AA batteries and it's ready to use.