Optical smoke-detector with interlink capability and a built-in 10-year lithium battery. Large visible easy-to-use test key. When the smoke detector is activated, it emits a loud and clear audible signal (85dB), activates the alarm sound in all interlinked detectors and sends a call to the monitoring centre via the social alarm unit. The smoke detector can be connected to Careium’s social alarms and carephones to create a secure home environment. It can interlink with Careium CO i10, Heat i10 and additional Smoke i10 detectors for maximum security.