Thank you for viewing! Brand new, unused, free shipping, anonymous delivery, and immediate purchase are all welcome ☆ ✼••┈┈••✼••┈┈••✼••┈┈••✼••┈ 【Product Description】 Brand: HAKINAKU Manufacturer: Shenzhen Huidu Technology Co., Ltd. 【High Performance & Automatic Calibration】Size: Length 8.5cm x Width 5cm x Height 2cm, Weight: 70g. This product is a high-quality air quality detector, employing high precision, stable performance, anti-jamming capability, and low power consumption. It features oxygen-independence and a long lifespan. Automatic calibration occurs after 24 hours of charging via USB cable. You can use and measure while charging. 【NDIR Method & 3-in-1】This product's CO manager detects carbon monoxide in the air using the non-dispersive infrared absorption (NDIR) principle. It captures the weak current generated by electrochemical reactions, enabling accurate and rapid detection of carbon monoxide concentration. It can detect in real-time every 2 seconds, and measures not only carbon monoxide but also humidity and temperature simultaneously, allowing you to immediately understand whether the surrounding environmental gas levels are good or bad based on the measured values. 【Measurement Range & Large Capacity Battery】CO measurement range: 0-1000ppm, Humidity measurement range: approximately 0%~95%RH, Temperature measurement range: approximately -20℃~60℃. Color display on a large screen for CO, humidity, and temperature. You can check the carbon monoxide concentration status at a glance. Equipped with a Type-C power supply (included) and a new 1000mAh battery, it can be used for approximately 72 hours with about 4 hours of free charging, Refresh rate: about 2 seconds. It can be used in various places to prevent carbon monoxide poisoning. 【Warning Display Color & Built-in Alarm】Based on the carbon monoxide concentration data, the indicator light color and comfort expression change: 0~50ppm (green) no alert (normal), 51~100 ppm (yellow) (warning), 101~200 ppm (orange) (warning), 201~1000 ppm (red) (alarm continues to sound), 3 levels of brightness can be switched, does not interfere with sleep, and you can monitor the CO gas concentration in the surrounding environment at any time. ✼••┈┈••✼••┈┈••✼••┈┈••✼••┈ Although it is brand new and unused, it has been opened once for product photography and inspection.