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What are the best SD100 and SD200 smoke alarm replacements?

The photoelectric Clipsal 755PSMA4 is the replacement for both, even though the SD100 was ionisation type as we no longer supply that type. There is also available a 755RLPSMA4 with a rechargeable lithium backup battery. All current smoke alarm models are compatible and inerconnectable with previous versions. Also available are the 755RFB mounting base with wireless interconnect, the 755RB mounting base with integrated relay, and the 755PFM flush mount.
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