Use the phone line analyzer as your first line of defense against the known and unknown enemies. Professional Safe Line Telephone Analyzer offers six levels of protection to deactivate, neutralize, monitor, and alert you to eavesdropping attempts. Both "on hook" and "off hook" line voltages are constantly displayed and will alert you to any out of the ordinary activity on your phone line. 

Features & Benefits:

• Digital Display Will Reflect Any Change In Your Phone Line Voltages
• Automatically Deactivates All Known Wire Tapping Devices (On Premise)
• Creates Shift of Frequencies In Crystal Line Transmitters
• Voice Simulation Causes VOX Equipment to Record Noise When Line is Not in Use
• Turns Off Voltage Sensing Recording / Transmitting Devices
• Fully Line Powered
• Requires No Batteries or AC Adaptor
• Instantly Alerts You to Extension Eavesdropping Attempts
• 100% State of the art Digital Surface Mount Technology