Huan tags are small Bluetooth transmitters with a very long range. However, in an urban environment, the range is typically between 300 to 400 feet, as buildings, cars and other people can sometimes block or weaken the signal.
Once the signal from your pets' tag reaches a Huan Sensor or another Huan user, it is instantly relayed to your phone, notifying you of your pets' whereabouts.
As the Huan Pet Protection Network grows, we will be able to cover larger areas across the country, essentially creating unlimited range and allowing you to keep track of your dogs and cats wherever you go.
For a more technical explanation, see Things you should know about Bluetooth Range.