Condition: 100% Brand New Buttons: 3 Buttons Electronics/Battery: No Frequency: 315Mhz/433.92MHz ASK Exchangeable Transponder Chip: ID44-PCF7935 Manufacturer: Aftermarket System: EWS System Interchangable frequency instruction: Please press “unlock” button continuely, then press “trunk”button for 5 times. The frequency could be interchanged between 315mhz abd 433Mhz. This function help you save money on stock . Fitment: For BMW X3 X5 Z3 Z4 3,5,7 Series (EWS System) ..... Important Note: 1. Please Check and make sure your remote is using the same transmitter and chip as Our items before buying. 2. The image is of the real product. Please compare your Car Key, make sure your item is as same as our product before you purchase. 3. The key is suitable for your Original key Frequency 315/433mhz Chip ID44 Key Only. 4. If the model number isn't exactly the same, please don't buy. It will not work correctly. Package Includes: 1 X Remote Key