A superb GSM room and phone call monitoring system that is completely undetectable.

Simply fit this ordinary looking and operating cordless phone system either at home or in the office and allow it to be used as any normal phone. Insert a local SIM card and you can then dial into it, at will, and hear everything that is happening within up to an 8 metre radius (Subject to ambient sound in the room).

What makes this product even more impressive is that as soon as it detects any sound it will send you a text message to alert you to listen in. It will even send you a text message if someone moves the phone from its original position and it will send you a text to alert you that it is receiving or making a call allowing you the option to listen in.

Should the cordless phone be disconnected from the mains power supply the internal Lithium battery will allow you to continue monitoring the room until the battery runs low, at which time you will receive a "Low battery"  text message which will let you know that you need to re-connect the phone to the mains. 

As this uses the GSM network to communicate there is no limitation with range and the target room and phone line can be monitored from the other side of the world, if necessary.  All you need is a working local SIM card.