Self Defense Alarm Lite vs Visual Displacement Meter

* Detect the 3.5 inch earphone jack to trigger the alarm - start the alarm when pulling out the earphone and close the alarm when insert the earphone in. * Detect the shake to trigger the alarm. (for the complete version) * 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.) Location and message data are transferred only between the two parties' App, and aren’t transferred to any third party to protect personal privacy. The App is suitable for users who want to protect personal privacy. PS: 1. We will add other functions in the future. 2. Continued use of GPS running in the background can dramatically decrease battery life. 3. Low battery, etc. might result in suspending or termination of APP in the backgrond. * This version doesn’t provide the selections for sound effects and volume levels, and the function of sending SOS message. (The complete version provides the selections for sound effects and volume levels, and the function of sending SOS message.)

The visual displacement meter is a high-precision visual measurement device used to measure surface displacement changes of structures, with a measurement accuracy of up to sub-millimeter levels and a maximum measurement distance of hundreds of meters. It can be used for deformation monitoring and detection of critical infrastructure such as bridges, tunnels, subways, slopes, and dams.