SITERWELL Smoke Detector, 10 Year Smoke Alarm with Photoelectric Sensor and Built-in Battery, Fire Detector with Low Battery and

Activation Before Installation: Press and hold the test button for more than 3 seconds until THE LED LIgHT IS ON, RELEASE IT within 2 seconds, and the smoke detector will make a beep, indicating that the activation is successful Please do not long press the test button and wait for the beep, because It is not successfully activated method 10 Years Life Time: The smoke alarm can be 10 years life time and has 10 years life time non-repalced battery You wont worry about replacing the battery any more And it can save energy and protect environment Fault Signal Alarm: The photoelectric smoke alarm is very easily tested only by pressed the button more than 5 seconds, the low battery will have a signal alarm which will recall you to change a new battery certified Safe and Reliable: The smoke detector has passed UL certification, its quality is guaranteed The smoke alarm dont contain any radioactive material an wont cause harm to humans body 24 Hours Home Protection: When the smoke detector is working, it will cut the risk of dying in a home fire by 50% while home fire starts every 83 seconds The faster you know about a fire, the faster you can escape from the fire