Have you needed to monitor room or office conversations and activities but have not been able to find a transmitter with suitable range that you are able to monitor from a comfortable distance? The infinity transmitter is the latest in surveillance technology. This amazing device allows you to monitor room conversations from anywhere in the world. It works with cellular phone technology and requires a working sim card to operate. Simply install the sim card into the transmitter and call it. The transmitter will not ring or make any sound, however it will answer and the enhanced microphone will pick up the slightest whisper. You can then sit back and listen from your own phone. There are no range limitations and the device can be battery powered for up to 7 days.