... smoke comes into the ionization chamber, it breaks the balance of current. The detector sense the imbalance is suitable for detect the smoke in house, shop ... press the test button to test the detector or blow a little of smoke into the detector to test it work properly. The detector will recover to normal ... 's artwork and logo MDC-0306 Wireless Smoke Alarm (Using in S-MDC-0210, S-MDC-0211, S-MDC-0212, ...