This product is an advanced Carbon monoxide tester that combines high-quality sensor to provide real-time monitoring of Carbon Monoxide (CO), Temperature, Humidity on its digital LCD display. It combines 3-in-1 functions to help you keep track of the air quality in your home environment, public places, outdoor camping,exploration and other activities and other fields, more flexibleand convenient air quality monitoring. It is easy to operate, with guaranteed quality, and is worth purchasing. Visible LED Display: 3-digit display, when a carbon monoxide leak is detected, the current value be displayed according to the concentration (note that it not be displayed when it is below 30ppm), an intuitive display for greater peace of mind. While this product can reduce your risk of harm by increasing your awareness of air quality, it can in no way or . Please instead take a comprehensive approach to living healthy and do not depend on this monitor alone to improve or save your life. Product Size: 70x70x28mm Display Method:LCD Screen Measuring Item:CO, Temperature, Humidity Detection Method: for CO Electrochemistry Concentration Unit for CO: ppm CO Measuring Range:0-500 ppm Atmospheric Pressure:12.5 PSI - 15.4 PSI Sampling Time:1.5 Seconds Temperature Range:-10C-50C(14F-122F) Storage Temperature:-10C-60C(14F-140F) Relative Humidity:20%-85% Humidity Range:20%-85% Power Source:500 mAh Rechargeable Lithium Battery. 5V DC Power Charging via Type-C Port How To Use Turn On / Off a) In power-on state, long-press Power Button to turn off the device. b) In shutdown state, single-press Power Button to turn on the device. Note: If you can't turn on the device, please plug in and charge it for a while first. CO Range (ppm) CO Detection Range: 0-500ppm Green Color ( Good ): 0-100ppm Orange Color ( Slight ): 101-200ppm Red Color ( Serious ): 201-500ppm CO Alarm a) CO alarm value is 100ppm. b) Single-press Power Button to turn on/off the CO alarm sound. Temperature Unit a) Double-press Power Button to switch the temperature unit between Celcius(C) and Fahrenheit(F). Colour:White Material:ABS Package Contents: 1x Carbon monoxide tester 1x Type-C Charging Cable 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.