This Isafenest smoke alarm is designed for home safety with a 10-year sensor and a 5-year battery. It features a loud 85dB alarm and a red LED indicator. The alarm provides 20-40 square meters of coverage and performs an auto-check every 33 seconds. Installation is easy with no rewiring needed, and all accessories are included. The exterior is made from flame-retardant ABS+PC material. Please note that after pressing the TEST button, the alarm enters a silent mode for 9 minutes, during which it will not alarm. Ensure the silent mode ends before performing the next test. The alarm is compliant with the EN14604 standard.