Tire-pressure monitoring system (TPMS) is an electronic system designed to monitor the air pressure inside the pneumatic tires on various types of vehicles. Small size, light-weight, high accuracy of sensing tire pressure , and easy installation, it also can withstand harsh environments. Easy to install and don't require additional hardware. Frequency:433MHZ Condition:100% New Fitment: For 9-3 2003-2007 For 9-5 2003-2007 For 2008-2009 For H C Zafira B 2003-2007 Colour:Green & Silver Material:Plastic+Metal Package Contents: 1 * Tire Pressure Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.