The HS-4201 is a private line analyzer that is the ultimate in US technology. This unit will digitalize the voltage level whether the line is in use or not, keeping a constant check on the integrity of your line. When it detects any kind of anomaly, an intelligent circuit will block the line, leaving it in mute tone, without being able to receive or place a call that would be intercepted by an intruder, thus having total control and security in the privacy of your conversations. At the same time, it has a system that detects any kind of radio frequency on the telephone line with a luminous and loud LED, alerting about the presence of wireless transmitters installed in the monitored line.This unit detects the following wiretappings:

-VOR ( voice activation) telephone recordings

-Line stealing

-Parallel lines

-Wireless telephone transmitters