Note Before Usage: 1) TPMS Does Not Require You to Perform Complex Operations. You Just Need to Turn on the Display First, and then Install the Sensor at the Corresponding Position on the Tire (RR, RL, FR, FL). You Do Not Need to Program Manually. All Parts Are Programmed Before Leaving the Factory. 2) Turn on the Display Before Installing the Sensor on the Tire. Do Not Install the Sensor on the Tire Until the Monitor is Turned On. This Operation May Cause Problems Such As Sensor Data Not Being Displayed. if You First Install a Sensor on the Tire, Start the Vehicle Immediately and Observe Whether There is Data Display After 5-10 Minutes. if No Data is Still Displayed, Remove the Sensor and Allow It to Stand for 10 Minutes Before Continuing with the Correct Installation Sequence. 3) If the Display Data is Not Displayed or Intermittently Displayed During the Use of the Display, the Wireless Signal Transmission of the Sensor May Receive Electromagnetic or Object Interference. the GPS Navigator Around the Display Can Be Removed to Avoid Interference. Note: The Tire Pressure Monitoring System Can Only Monitor the Tire Air Pressure and Temperature for a Period of Time, but Can Not Monitor the Instantaneous Change. Therefore, the Tire Pressure Monitoring System Cannot Predict the Sudden Tire Damage Caused by External Force. When the Tire Pressure Monitoring System Gives an Alarm, Please Stop in a Safe Position As Soon As Possible. Suggested: Check the Tire Condition at Least Once a Month to Eliminate and Repair Tire Faults in Time to Ensure Driving Safety. Function -Solar charging, don"'"t need to connect car cigarette lighter to charge -Color LCD digital display for clear display of tire information -Monitor the pressure and temperature of 4 tires in real time -Low air pressure/high temperature alarm -High Temperature / Leakage / Low Battery Alarm -Intelligent Shock Boot when car moving, don"'"t need to turn on/off -Wireless connect with sensors, easy install,attached to glass -Two units (PSI / Bar) changeable, you can set the one you like. -Intelligent On and Off When the car is started, the vibration of the machine is automatically opened and the machine is shut down automatically when it is still, without manual operation. External Sensor - Easy to install, convenient to replace - Dust-Proof / Water-Proof / Anti-theft - Anti High Temperate and Cold - IP67 Protection / Waterproof - Working Temperature: -20-85 - Battery Life: 2 Years, replaceable (External Sensor)