You can set the 5 numbers anytime. They will save in the apps database.
When pressing the Panic button once 5 sms will be send to 5 family members.(for example)
When holding the Panic Button, the number stored under Number 1 will be called.
When using the voice command, it will also send a sms to number 1. and it will switch on the alarm.
To find out on how to build the device see the Schematic and code Button/link at the bottom of the app, and follow the instructions.
You do not need the device, the sms and call functions of the app will work without connecting to bluetooth device.
The commands are simple for the voice Function.
1. alarm on.
2. alarm off.
To build the device you need.
1. 1 x HC-06 Bluetooth module.
2. Arduino uno, any copy will do.
3. 12v alarm, with adapter.
4. 1 channel relay.
5. A set of jumper wires. MM/FF/MF
Check out the Schematic & code button for more info on the instructions.
Or follow this link for the instructable http://goo.gl/4hHsxU