I decided to test the alarm by leaving a window open and waiting until the LED's were blinking slowly then leaning in and opening a door. The alarm sounded by a siren which sounds as though its located at the rear. However it wasn't very loud, in fact I doubt it would attract any attention at all! Is the standard siren rubbish or could mine be faulty? I've heard that on earlier models the alarm sounds the horn and later models use a siren. I was surprised that the door opened in the first place! I take it the A3 has no deadlocks?