Correct connect step Step 1. Open Bluetooth-compatible and Location on your phone Step 2. Open sytpms App NOTE: if your phone Bluetooth-compatible or Location closed, when you running sytpms App first, and than open Bluetooth-compatible or Location , the App will connect fail, Please del sytpms running record, and use correct connect step. Feature: 1. High Quality: The Vehicle Sensors Tyre Pressure is made of ABS+Copper material, impact resistance, heat resistance, low temperature resistance, chemical resistance, excellent electrical performance. 2. Bluetooth-compatible APP Vehicle Sensors Tire Pressure Monitor: Connect mobile phone Bluetooth-compatible, monitor Vehicle Sensors Tire Pressure, APP set high, low pressure and high temperature alarm values. 3. Data Display: The Vehicle Sensors Tire Pressure monitoring system can display real-time Vehicle Sensors Tire Pressure data, the Vehicle Sensors Tire Pressure change is immediately known, and the Vehicle Sensors Tire Pressure of four tires is checked at the same time. 4. Alarm System: The Vehicle Sensors Tire Pressure monitor has a reliable alert system, it will alert you when something abnormal happens. The mobile phone will alert you when the Vehicle Sensors Tire Pressure is too high or too low, and alert you when there is an air leak. 5.