KEY BLANK - FOLDING FLIP KEY REMOTE - UNCUT FOR BMW E30 E28 E23 E24 M3, M5, M6 It is compatible with some aftermarket alarms and keyless entry systems with a 315MHz frequency. IT WILL NOT WORK WITH THE FACTORY SYSTEM! You can order an adapter to make it work with your BMW. FREE general programming instructions INCLUDED. This key will need to be cut to match your BMW key.