Compatible with SM-22HI, SM-22RCI ONLY.Compliant with the New Scottish Legislation Feb 2022.Tamper-Proof 10 Year 3.0 V lithium battery.Advanced photoelectric sensing technology.Faulty warning, Low battery warning.Hush function, Manual Test / Auto-Reset.Big test button for easy operation.Dustproof, mothproof, and anti-white light interference design.Automatic calibration, guaranteeing accurate sensitivity.Automatic compensation design with stability performance, suitable for long-life operation, low false alarm. [SAFE TECH]: British Brand, ISO 9001:2015 Certificate, Fully Insured UK Company.[Standard]: Smoke: EN 14604:2005 Approved by: TÜV Rheinland.[Convenience]: Easy to Pair and Install, UK Tech Support Provided.

Power Source：Sealed 3.0V lithium battery(Built-in)/Battery Life：10 year*/Product Life：10 year*/Type of Sensor：Photoelectric/Standby Current：＜30uA/Alarm Current：＜70mA/Working Temperature：-10℃~+50℃/Relative Humidity：≤95%RH/Wireless Signal： Encrypted RF433.92Mhz GFSK/Low battery alarm threshold：2.6±0.1V/Alarm Sound pressure：≥85dB/RF Distance：＞25m depending on working environment/Alarm Mode：Siren with flash/Execute Criterion：EN14604:2005/AC:2008

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