DPAccessories DP-TPMS-4 Tire Pressure Monitoring Sensor/TPMS Monitor 315 Mhz W/Aluminum Stem DP-TPMS-4 Tire Pressure Monitoring System Sensor Patented sensor technology ensures these sensors meet or exceed OE quality standards. Military grade battery for long service life. Can be triggered read and relearned with all major TPMS scan tools. No additional parts needed for installation comes with sensor body and replaceable valve stem. Professional installation required.