Features: [Compact and Exquisite]: Compact body design, simple and stylish appearance, , and easy to carry. The sensor and theair are fully contacted, highly sensitive, and accurate in the detection of small particle content. Scientific test button for easy operation. It can be wall-mounted for convenience and ease. [3.1-inch LCD Display]: 3.1-inch LCD display, with ultra-wide viewing angle, so you can see the CO concentration, temperature and humidity readings, time, date, and clock day of the week at a glance. With 3 icons to indicate the real time concentration level. [CO Concentration Measurement]: Built-in nice-performance CO detection chip, real-time monitoring of CO concentration, to obtained accurate data easily in harsh environments. High sensitivity, superior interference resistance ability, and stable working performance. With ultra-low power consumption, fast computing speed, and accurate data measurement function. [Temperature and Humidity Measurement]: Built-in high-precise temperature and humidity sensors can sensitively detect temperature and humidity changes at the same time, and the detection results are more accurate. [Mobilephone APP Control & Voice Control]: Connect to the cellphone Tuya APP, just a simple configuration to free your hands. Supports voice commands, compatible with for Alexa and Google Assistant to inquire the indoor CO concentration, temperature and humidity of your home by voice control, more humanized. Strong Heat Dissipation: Hundreds of ventilation holes reserved on the housing not only accelerate the convection between the air and the machine, thereby realizing effective detection but also provide a fine heat dissipation effect. Wide Applications: This carbon monoxide detector is a very practical device that can be widely used in a of occasions, such as homes, greenhouses, camping barbecues, factories, automobiles, environmental monitoring, and so on. Specifications: Name: CO Concentration Detector Battery: 3 x AAA battery (included) Display: LCD display Material: plastic colour: White Package Contents: 1 x Gas Detector 1 x USB Cable 1 x English instructions 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.