RuuviTag Classic

RuuviTag is a wireless Bluetooth sensor node that measures temperature, air humidity, and movement. You can read live measurements and history data directly on your smartphone using Ruuvi’s mobile app for Android and iOS.
 
Use your imagination and measure almost anything at your home, at work, in your hobbies.
 
MULTI-YEAR BATTERY
User-replaceable CR2477 lithium battery. Lifetime 2-3 years.
HISTORY LOGS
Up to 10 days of downloadable environmental history data. Logged every 5 minutes.
LONG RANGE
Bluetooth beacon technology offers better range compared to traditional Bluetooth devices.
NO PAIRING
Because no connection is needed, your phone can simultaneously listen to numerous sensors.
WIDE TEMPERATURE
Wide -40°F to +185°F temperature range with the special Ruuvi battery. (Default -4°F to +158°F.)
WEATHER RESISTANT
Tolerates cold, hot and wet conditions.
OPEN SOURCE
Firmware, electronics and mobile apps are all open source.