Safety monitor for tyre pressure suitable for vehicles with up to 4 tyres monitors tyre pressure up to a distance of 40 feet via bluetooth download the tyre pressure monitor app on ios or android devices easy to use app for the status of all 4 tyre pressures and inside tyre temperatures app allows the tyre pressure to be set for each individual tyre which will alert via audio vibration sms andor emails when the pressure is 20 over or under the set pressure