... twinkling but DS2 and DS3 without light, it means that the environment is acting certain disturbance, ... no matter DS2 and DS3 are in what status, it means that the installation place is seriously disturbed, ... , DS2 and DS3 not twinkling (lighting), it means that it is in best status. 3. Modulation ... board has been changed (stagger frequency), T04 receiver does not need adjustment. 4. Sound/light alarm ...