Features:  2 Models for Option: P1 is multifunctional and can test the concentration of CO2, PM1.0, PM2.5, PM10, and calculate the number of 0.3μm, 0.5μm, 1.0μm, 2.5μm, 5.0μm, 10μm particles; P1-C can only test CO2 concentration. Both of them can be connected to 2.4GHz wifi, which allows you to remotely monitor anytime anywhere.  Carbon Dioxide Tester: Adopts sensitive sensor, with porous air convection, quickly and accurately detects CO2 concentration in the living environment. It can be widely used in home, office, car, classroom, hotel, gym, greenhouse, warehouse, wine cellar, etc.  TFT Color Screen: Displays CO2 concentration, 4-color Indicator (green-good, moderate-yellow, orange-unhealthy, red-hazardous), battery level, etc. TFT digital color screen for easy and clear reading even in dark environments.  Rechargeable Design: Built-in 2600mAh rechargeable lithium battery for strong endurance. With USB interface, quick to charge via power adapter, power bank, laptop, etc.  Concise Appearance: Simple but stylish appearance, desktop or wall mounted installation, fits in well with different styles of houses. Compact and lightweight, easy to carry.  High-temperature Protection: The air quality tester will automatically shut down when the temperature exceeds 65& 8451; for protection.    Note: Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding.    Specifications:  Model: P1/ P1-C (Optional)  APP: Compatible with "Tuya Smart" APP, 2.4GHz Wifi  Color: White  Material: ABS + Electronic Components  Screen: TFT Digital Color Screen  Resolution: 240(3RGB)*320  Power Supply: 5V/ 1A  CO2 Detection Range: 400-9999PPM  CO2 Detection Accuracy: ±50PPM/ ±5%  PM2.5 Detection Range: 0~2500μg/m3  Built-in Battery: 2600mAh Lithium Battery  Working Environment: -9~55& 8451;, <90%RH  Item Size: 90 * 70 * 35mm / 3.54 * 2.76 * 1.38in  Item Weight: 162g / 5.69oz (P1); 139g / 4.90oz (P1-C)  Package Size: 11.7 * 11.2 * 7cm / 4.61 * 4.41 * 2.76in  Package Weight: 309g / 10.88oz (P1); 284g / 10.02oz (P1-C)    Package List:  1 * Air Quality Tester  1 * USB Cable  1 * User Manual (English, Spanish, French, Russian, German, Portuguese, Italian, Japanese, Korean)      By the way,if you like our store,please add our store to your Favorite Stores.You can get our New arrival and Discount   information in time.