* Detect the earphone jack to trigger the alarm - start the alarm when pulling out the earphone and close the alarm when insert the earphone in.

* High intensity sounds of alarm can effectively deter offenders. There are many sound effects and volume levels can be selected.

* Support the running in the background; you can execute other functions, e.g., listening to music, playing games, browsing the web page, etc.

* In order to increase the sensitivity of the alarm when pulling out the earphone plug, please do not insert it to the end (too tight).

* One of use scenario: Insert the earphone in the device in advance; when encountering the bay guy, you can immediately pull the earphone plug out to start the alarm.

* Provide the display function of real-time GPS coordinate.

* Provide the track display function on the map for the latest activation period of the alarm.

* Provide the function of sending SOS message and location to notify the designated object when tiggering the alarm. (The designated object must install this APP.)

PS:
1. We will add other functions in the future.
2. Continued use of GPS running in the background can dramatically decrease battery life.