Smoke alarm: highly sensitive 6 seconds alarm Stable and reliable High sensitivity: Specially designed light sensor, produced by patch processing technology, can effectively detect the smoke generated during the initial flame retardant stage of fire or after generation highly environmentally friendly material, high temperature resistant and not easy to burn, beautiful and practical High-decibel loudspeaker Long life span: Using imported magnetic loudspeaker, the sound is twice as common as normal smoke, which is deafening Highly sensitive smoke sensor: used independently, when the smoke sensor a certain amount of smoke concentration, the smoke sensor emits an alarm sound, alarming 90 decibels Square battery: 6F22 Quiescent current:Less than or equal to 10uA Alarm current: Less than or equal to 10mA Alarm sound: greater or equal to 85dB Working temperature: -10~50 Celsius Relative humidity: Less than or equal to 95%RH colour:white material:ABS size:102x102x40mm Package Contents: 1*Smoke detector Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.