The unit is still new in box. I bought it for my RV, but it came with a pressure system already. It is never been used and never been opened. This tire pressure monitoring system from TST Truck Systems Technologies is a top-of-the-line solution for keeping your tires in check while on the road. The system comes with four programmable sensors and a color monitor to give you real-time updates on your tire pressure. With its easy-to-use interface, you can quickly check the pressure of each tire and ensure that you’re always driving with optimal tire pressure. The TST-507-RV-4-C model is designed for use with RVs, and it’s built to last. The sensors are durable and can withstand harsh weather conditions, so you can trust that they’ll keep working no matter where your travels take you. Plus, with its simple installation process, you can have this system up and running in no time. Get peace of mind on the road with the TST-507-RV-4-C tire pressure monitoring system.