5-Hour Line Activated (No Battery Drain) Micro Cassette Telephone Recorder for single line phones. (2 1/2 hours unnattended per tape side) Simply plug in the SW-500 to any standard modular phone jack, place unit in record and thats it! All your important calls from any extension will be automatically recorded.
Recorder turns on only when phone is in use, so batteries last for a full 20 hours of recording, even if it takes weeks. The SW-5000 Comes complete with modular telephone cable, duplex adaptor, 2 (AA) batteries, and D-140 standard cassette. Of course, the "Silent Witness" is totally silent.