For first prototype I've decided to use as many pre-buit parts as possible.

So, BOM -

• Arduino Leonardo;
• GPRS Shield - I've selected this one but you may use any on your choice. But keep in mind what you will need microphone input and audio output;
• Power source shield. Once again - I've selected this, but you may use any suitable for you. In perspective this first aid kit should use non-rechargeable bat;
• GPS Shield - Not yet decided. For first prototype will use software stub.