... properly, in addition to not to change the battery products outside yuan Functions:Ø ion chamber adopts single ... with long life.Ø power consumption is small, use the battery power supply, safe, convenient installation, do not connect ... other power source;Ø low voltage alarm functions, remind you to replace the battery;Ø cycle test: suggest you had ... Ambient humidity ≤95%(40±2) Smoke Alarm, Sensor Alarm