Alerts you of low or high tyre pressures to ensure a safe drive Includes four wireless tyre pressure sensors and one in-car display unit Audible and visual warnings if the pressure falls below user-preset levels Fast leakage alert if pressure drops by more than 1.5 PSI within 12 seconds Tamper-proof tyre pressure sensors with replaceable CR1632 batteries Batteries last an average of 2 years on typical usage Pressure sensor range of 050 PSI 1.5 PSI Sensors read tyre pressure every 4 seconds with 5 minute updates to monitor Sensor unit works off DC 824V input for versatility Also monitors tyres temperature Can be used with up to eight sensors in total simultaneously WarningThis system can effectively monitor air pressure and temperature within the tyre but it cannot prevent traffic accidents. Use of this system requires the end-user to ensure that the vehicle is in a road-worthy condition before use including verifying the condition and pressure of the vehicles tyres. This system is designed as a safety tool to help drivers understand when their tyres are approaching an unsafe condition. Improper driving habits or careless driving can cause tyre damage and this system can not warn for all such conditions encountered whilst driving that may result in tyre failure. This system is not a substitute for regular tyre inspection and any necessary maintenance but is designed only as an aid to monitoring tyres. Unsafe driving poor road conditions other drivers tyre load restrictions overloading of a vehicle and tyre manufacturer specifications are all salient factors in the longevity and safety of any tyre. As such the driver of any vehicle equipped with this system is strongly advised to educate themselves with the specific peak operating requirements of their vehicles tyres as specified by the tyre manufacturer and to ensure this system is correctly configured to respond to those requirements.