First of all, you need to insert an active SIM to cable. Your personal mobile can call this SIM phone number and hear the voice around the cable at any time.
Get GPS location: Use personal mobile to text "DW" to the cable's phone number and you can get location information.
Set up Voice-activate Callback: Text "1111" and send to the cable's phone number. When cable's environment is larger than 45db, cable will automatically call your personal mobile and you can hear the sound at that moment.
Cable Compatible With: iPhone 7/7 Plus/6/6 Plus/6S/6S Plus,SE/5S/5,iPad,iPod Nano