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User Manual 10 YEAR LIFE SMOKE ALARM ST-622 WITH LOW BATTERY WARNING SILENCE INTRODUCTION The ST-622 multi-criteria high-performance detector is the ultimate User Manual. SMOKE ALARM. 10 YEAR LIFE. ST-620 NOTE: This user manual is also available in large read this user manual fully before installing. IMPORTANT: This user manual contains important information regarding the operation of your FireAngel smoke alarm. Ensure you read this user manual fully before. NCC (National Caravan Council) Approved. The ST-620 being NCC approved is ideal for use in Caravans or Motor Homes. A larger, concave central button has beenView and Download Thermoptek FireAngel ST-620 user manual online. FireAngel ST-620 smoke alarm pdf manual download.