1, Specialized integrated electric-circuit with stable working condition, high sensitivity and low power loss is simple to install and needs no debugging;2, Specialized ionization smoke detection chamber can make precise smoke detection of primary fire;3, Can make automatic detection of circuit and power source as well as imitation of alarm testing;4, Specialized ionization smoke detection chamber can make precise smoke detection of primary fire;5, 9V battery power supply with buzzer can send audio and video alarm;6, Widely used in fire forecasting alarm for family, hotel and apartment.