The application blinks the device LED every few seconds. The idea is to notify the user about the state of the device via the LEDs (SMS, EMail, missed calls, wifi bluetooth etc.)

Main features:
* Including sequences for normal, low battery, no-signal, new message (Voice/SMS/MMS/EMail), Missed calls, appointments, wireless status (bluetooth and wifi) and charging level.
* Almost all sequences can be configured via the settings application.
* Sequences may include blinking the green and orange LEDs (in HD2 - may be configured in other devices), the keypad LED, vibration and playing a wav file.
* If the radio is turned off or there is no signal, another orange blink occurs (in addition to the regular one). * When the phone is charging the orange LED lights constantly, every few seconds a sequence of green blinks according to the batter level occurs (20-40% - 1 blink, 40-60% - 2 blinks, 60-80% - 3 blinks and 80-100% - 4 blinks). If the battery is fully charged - the green led lights constantly. Blink interval and length can be set via the registry. Different blink interval for idle mode and when notification exists (new message/missed call).
* Running the link once starts the application, on blink sequence occurs. Running the link again runs the configuration application from which the service can be stopped.

Further information and new version may also be found on the applications thread on XDA:
Blinker's Homepage