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FDS181C Alarm Strobe and Horn Product Manual Overview FDS181C alarm strobe and horn is compact design with nice appearance. It adopts high lightness flashtube and loud horn. By setting, it has three selections of alarm tones. For two-wire installation, FDS181C can be easily installed.
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7. Insert the cover bottom to the base first and then push top until close tightly (see Fig. 7 & 8). It would not cause any damage if inversed connected as the FDS181C is inversed wired protection, but it will not work until the connection is correct.