Our telephone tap nullifier has the greatest ability to actually defeat telephone taps! Also the telephone tap nullifier utilizes technology that jams any listening device which use the telephone line to listen to room conversations, This telephone tap nul Specifications: ¥ FCC approved ¥ Made in USA ¥ Normal and secure calling modes ¥ Monitors exact line voltage in on hook and off hook condition ¥ Stops automatic recorder activators ¥ Alerts to extension pick ups and lineman test ¥ Deactivates automatic parallel line tranmitters Includes: ¥ AC adapter 12V with 500mA ¥ Telephone cord SIZE: 5 3/8" x 5 3/8" x 1 1/2"