The unit is a photoelectric smoke alarm device. With the photoelectric technology, it is more sensitive to detect slow smolder fires which general thick, black smoke and may smolder for hours before bursting into flames. The smoke alarm device does not contain the radioactive material which is harmless to the environment.

  A 3V build-in lithium battery provides 10 years battery life and warns you when the battery power is low. In order not to disturb your rest, this product is designed with silence function and no disturb function. Ten years later，the alarm detection signal will be decayed, when attenuate to the certain value, the alarm will send a fault signal to warn you to replace the product immediately. The product is designed with the test function by pressing the test button, which is used to test to assure the product working normal. Weekly testing one time is required.This product is designed with Wireless interconnection function, it can realize Wireless Interconnection alarm.