• INFINITY Transmitter Full Monitoring: Unique capability allows you to LISTEN-IN on every word and sound that the eavesdropper is monitoring.

  • Complete Spectrum Sensitivity Adjustment: Eliminates troublesome transient RF signals that are extremely confusing to most other Counter Surveillance detectors.

  • Rapid Detection and Location: Quickly pinpoints the exact location of any eavesdropping device.

  • WARRANTY: 1 Full Year including all parts and labor. If, in the unlikely event that any repair becomes necessary, simply return it and we'll repair or replace it at no charge.

  • Simple Recording Capability: Output jack (line-out) enables full recording of any detected sounds.

  • Extremely Simplified Operation: Quickly determines the telephone line condition and indicates whether Series or Parallel Telephone Transmitters, Recording Devices, INFINITY Devices, or any other type of eavesdropping device is present on the line.

  • EXTENSIVE Information Package: Includes Hi-Tech Information Package JAM-PACKED FULL of some of the most exciting and fascinating reading imaginable.
  • GUARANTEE: Full Money Back Guarantee. If the CSD-21 fails to do every single thing that we say it will, or if for any reason at all, you're not completely pleased and 100% satisfied, simply return it within 10 days of the date you receive it for a Full and Prompt Refund. And, No Questions Asked!

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About Us

Our products are used by police agencies, private investigators, security firms and individuals in all 50 states and over 30 countries. The designer of our equipment, John Meyner, has been in the business over forty years. Read more about us.


All of our products come with complete US-based technical support in addition to detailed instructions. If you ever have any questions, you can always call us toll free at 1-844-921-4750 and we'll be happy to assist you.

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