Feature: 1. Dense openings are arranged to facilitate air circulation and heat dissipation, considerate design. 2. Visual carbon dioxide alarm system, so that carbon dioxide concentration status is clear at a glance. 3. Built‑in lithium battery, support USB charging, it has low battery reminder function, long standby time. 4. Intuitive and vivid expression of comfort, plus indicator lights that change color according to different levels of carbon dioxide concentration, convenient for observation. 5. It can be placed on desktop or hung on the wall. Light weight and in small size, easy to store and carry. Specification: Condition: 100% Brand New Item Type: Carbon Dioxide Detector Material: ABS Power Supply Mode: Built-In Lithium Battery Battery Capacity: 2400 MAh Product Description: In the state of the information screen, the indicator light has a breathing gradient effect, and the user can wake up the backlight by pressing any key. After each wake-up, if there is no key operation, the product will automatically turn off the backlight of the screen after 10 minutes, but the indicator light will still indicate the current air quality. If you need to convert the backlight mode, you can press the B button for a long time. The backlight mode can be a constant light mode, or it can be automatically turned off after 10 minutes.. Package List: 1 x Detector1 x USB Charging Cable1 x Manual