Our remote is complete new For BMW 3 5 7 SERIES E38 E39 E46 3 button remote key, with PCF7935(ID44) chip, 315/433 mhz (interchanged), EWS system , interchangable frequency between 433Mhz and 315Mhz. We will send the remote with 433Mhz, if you need 315Mhz, please contact us. You also can interchange the frequency by yourself. 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 . This is an after market replacement key, and the remote will need programming by an auto locksmith.