The Bluetooth SensorTag packs the following sensor: Contactless IR temperature sensor (Texas Instruments TMP006) Humidity Sensor (Sensirion SHT21) Gyroscope (Invensense IMU-3000) Accelerometer (Kionix KXTJ9) Magnetometer (Freescale MAG3110) Barometric pressure sensor (Epcos T5400) On-chip temperature sensor (Built into the CC2541) Battery/voltage sensor (Built into the CC2541) The reference design