Advanced CO detection: The carbon monoxide detector has a highly sensitive sensor that can detect carbon monoxide concentration within the range of 0-999ppm. This can accurate and precise detection of low CO levels, thereby providing early warning for potential threats. LCD display with real-time data: The built-in LCD display of a portable carbon monoxide detector provides real-time monitoring, allowing users to easily read and interpret the current CO levels in the surrounding environment. Clear and intuitive display ensures a quick and easy understanding of the detected CO concentration. Immediate alarm and visual indication: If the level of carbon monoxide increases, the CO detector will activate an audible alarm to alert passengers. At the same time, the LCD display will have a prominent warning flashing to immediate be taken to prevent CO exposure. Battery computer warning low: The handheld travel carbon monoxide detector includes a low battery indicator to notify the user when replacing the battery. This function ensures continuous and uninterrupted operation, so the detector remains fully functional at all times. Compact and portable design: The mini design of the carbon monoxide detector allows for easy placement in various locations around the home or workplace. Its compact size also allows for worry free portability, making it perfect for use in hotels, dormitories, RV cars for travel, and other temporary accommodations. Material: plastic colour: black Package Contents: 1 x Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.