1. You can insert a GSM SIM card into it, put it
anywhere you want to listen. And then you can call it using another
phone. You can hear the voice around it and others don't know you
are
listening.
2. N9 has voice trigger
for call back function. When you call it and get through, it will
record your phone number as admin control number. When there is
voice around the device, it will call back to your
number automatically.
