Just had a flick through Microcat and there are two options on a Defender. One is a conventional square-box plastic alarm siren with integral battery[£77]; the other is an ordinary round horn and is described as "Horn/sounder unit [alarm without battery back-up. £17.64]
As there is nowhere on a Defender to hide anything; [except maybe the front inner wing closer panel] if you haven't seen the siren unit; then it uses the main horn as it's sounder.
Edited by Screwloose on 27/11/2008 at 18:13
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