... Powered by AC/DC AC/DC Powered Interconnectable Photoelectric Smoke Alarm (smoke detector,fire alarm system) Insects Proof1. Non-radioactive technology for ... Low-battery and battery missing warning indicator9. Auto-reset when smoke clears 10. CE, BSI, SAI Global approved, comply ... break in the mains supply the battery will give detector operation for 1 year minimumOperation Current<20mA operation(in ...