Record and play back phone calls through your telephone’s handset by easily connecting this unit between your phone and your own recorder (with 1/8″ mic and earphone jacks). Designed to work with standard or voice-activated recorders. Will not work with cordless or cell phones. Connects between handset and base of phone; 3.5 mm plug connects to recorder mic (to record) or headphone (to playback) jack. Includes printed instructions.