Name：Tire Pressure Mornitoring System Model：TPMS-SNV204 Product Introducation： It fit tire valve-stem mounting Sensor-Transmitter, Receiver and status light for 4-wheel vehicles. It can reliably monitor up tire pressure and display the readings whenever the vehicle is running or idle, the status light on green shows all wheels are in abnormal pressure and/or temperature, otherwise, it will turn into red or flashing, and generate an audible warning signal.