Our company also developed TPMS 4-1 as a common user system.Install after purchase.The TPMS 4-01 is a sensor in a transmitter attached to a wheel.This is a system that detects tire pressure and notifies the driver via in-car monitors (receivers).By monitoring the tire pressure, and the driver's tire pressure drop warning, not only to ensure the safety of driving, but also by extending the life of the tire, improve the work efficiency and environmental performance.It does this by reducing some wear and tear, preventing worsening fuel consumption and reducing carbon dioxide emissions.