RuuviTag broadcasts Bluetooth Low Energy messages one time every single second, 24/7. This greatly enhances range between RuuviTag and receiver (mobile phone).
Without obstacles in open air, we have measured extreme ranges (>500 meters or >1600 feet). However, mobile phones’ Bluetooth antennas differ a lot and some phone models have better reception than others. Any obstacles also greatly decrease the range.
Due to these facts, we don’t promise any exact range for the sensors.