Mini Smoke Alarm.

ZR150S - stylish smoke alarm operated by a 3V lithium battery for 10 year lifetime.

ZR150S smoke alarm utilizes photoelectric detection technology to sense smoke from different fires. Unit have a sensing chamber which uses a beam of light and a light sensor. Smoke particles entering the chamber change the amount of light that reaches the sensor. The alarm sounds when the smoke density reaches a preset level. The smoke alarm is equipped a self-diagnosticand checking feature to ensure correct operation through its service life.

The device builds the buzzer as a test button on the front cover, however if false alarms occur, the button can be used to silence the sound for 10 minutes.

You can find the product by unique code: ZR150S.