This is an environmental sensor with temperature and atmospheric pressure. It is -generation upgrade of BMP085/BMP180/BMP183. BMP280 is an absolute pressure sensor, specially designed for mobile phones. This sensor is suitable for all kinds of weather sensing, and can even be used for I2C and SPI! This precision sensor is the low-cost precision sensing solution for measuring air pressure, +/-1hPa absolute accuracy, and temperature +/-1.0Celsius accuracy. The air pressure will change with the altitude, the air pressure measurement is very good, and it can be used as a +/-1 altimeter. Power supply: 3V Digital interface: IC (up to 3.4 MHz)/SPI (3 and 4-wire, up to 10 MHz) Air pressure range: 300-1100hPa Needle pitch: 2.54 mm Module size: 11.5 mm x 15 mm typical application: Enhanced GPS navigation (e.g. first repair time, death detection, slope detection) Indoor navigation (floor detection, elevator detection) Outdoor navigation, leisure and sports applications Weather forecast Healthcare applications (e.g. rangefinders) Vertical speed indication (e.g. risk/sink speed) Notice: The installation of electronic modules requires basic knowledge, as well as a certain electronic professional foundation and hands-on ability. Please buy carefully! colour:As shown Material:ABS Package Contents: 5 x Barometric altitude sensor(There are differences in different batches) 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.