Package includes: 1 piece of BMP280 Pressure Sensor Module 
 
Feature:
Model: GY-BMP280
Chip: BMP280
Power supply: 3V
Communication method: Standard IIC/SPI communication protocol
Air pressure range: 300-1100hPa
Pin pitch: 2.54mm
Module size: 11.5mm*15mm
 
Typical application:
Enhancement of GPS navigation(e.g.time-to-first-fix improvement,dead-reckoning,slope detection)
Indoor navigation(floor detection,elevator detection)
Outdoor navigation,leisure and sports applications
Weather forecast
Health care application(e.g. sirometry)
Vertical velocity indication(e.g. risk/sink speed)
BMP280 is an environmental sensor with temperature, barometric pressure that is the next generation upgrade to the BMP085/BMP180/BMP183. This sensor is great for all sorts of weather sensing and can even be used in both I2C and SPI!
This precision sensor is the best low-cost, precision sensing solution for measuring barometric pressure
with ±1 hPa absolute accuracy, and temperature with ±1.0°C accuracy. Because pressure changes with altitude,
and the pressure measurements are so good, therefore it can be also used as an altimeter with ±1 meter accuracy
 
Bullet points:
Model: GY-BMP280
BME280 Atmospheric Pressure, temperature Sensor
Interface: I2C (up to 3.4MHz), SPI (up to 10 MHz)
I2C address: SDO LOW 0x76: SDO HIGH 0x77