This unit allows real time monitoring of your tyre pressure and temperature through 4 wireless sensors attached to your tyres. It has the capacity of running up to 10 sensors at a time so if you are towing your caravan or boat away on your adventure you can monitor all your tyres at the same time. Tyre pressure monitoring systems help to extend the life of your tyres by making sure they are correctly inflated, reduce driving risk and improve fuel efficiency. The head unit is solar powered with a long lasting battery life and intelligent sleep mode for power saving. The external sensors have replaceable batteries that will last for about 2 years. Take the stress out of your trip with visual and audio alarms for low/high pressure warnings and sensor failures. The auto brightness settings make it easy to read while you are on the road. This little beauty is compact and easy to install and comes with everything you need to get started.