Grundig Smoke Detector VDS 10 Years Battery

In the event of an alarm, there is an audible and visual indication. An acoustic 90 db sound from the internal siren will be heard and the light will blink.During the smoke alarm is alarming, you push the test button, it will be paused the smoke alarm for approx. 10 minutes. The red LED will still flash every 10 seconds, it indicates the smoke alarm is working in the hush mode.SpecificationsBattery: 3V DC CR123A Litium (not replaceable)*Operating temperature: 4-38 degreesOperating humidity: 25-85%Smoke sensor: OpticalAlarme volume: 85db