Features: 【Multi-Functionality】: The BME280 simultaneously measures temperature, humidity, and atmospheric pressure, while the BMP280 detects temperature and atmospheric pressure, ideal for projects requiring comprehensive environmental monitoring. 【Operating Voltages】: Supports 3.3V and 5V power supplies, compatible most development boards. 【Communication 】: Utilizes UART for data transmission, facilitating connection. 【Compact Size】: Compact module design saves space, facilitating integration into various small devices. Ideal for environmental monitoring, and similar applications. 【Fast Response Time】: Features rapid response to environmental changes, ensuring real-time monitoring. Specifications: [Component]: PCB [Product size]: 2.3x1.1cm [Product weight]: 6g [Working voltages]: DC3.3V/5V [Communication]: (UART) port [Measurement accuracy]: BME280: Temperature: ±0.5°C, Humidity: ±3%relative humidity, Pressure: ±1hPa; BMP280: Temperature: ±0.5°C, Pressure: ±1hPa [Rate]: 9600 [Data bits]: 8bits Types：A BME280 Temperature and Humidity Atmospheric Pressure/ B：BMP280 Temperature and Atmospheric Pressure Package Includes: 1PC sensors module 1PC pin header 1PC packaging bag note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution