GSME Trader BESMOKEY 4

The BESMOKEY4 is 240V ~ Mains powered, 50Hz, 80mA photoelectric smoke alarm, with 9 volt backup battery. 

General Information

A PE240/9v mains powered unit with a 9 volt backup battery. Supplied by GSM Electronics in Adelaide 

COMMON ISSUES & EXPIRY

Going into terminal full alarm state, without trigger. Soft plastic bracket cover is easily dislodged.

How to Open

The BESMOKEY4 has a side based push button release.

Our Opinion

Although this model was reliable early on, a growing number of units are showing terminal faults within 2–3 years of installation. In 2025 we’ve seen a noticeable increase in service calls and replacement requests, particularly from newer homes where hard-wired interconnection exists. These recurring issues cause ongoing inconvenience for homeowners. Overall, we give this model a 1/5 reliability rating.

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