The TP-7, telephone pickup, makes phone recording two sides of the conversation. Just plug the TP-7 jack into the "MIC" jack of your recorder, and put the earphone side into your ear. When speaking on the telephone, the TP-7 will capture both sides of the conversation for recording by your voice recorder. Includes adapter to convert from monaural 3.5mm mini-plug to stereo 3.5mm mini-plug. Also includes monaural 3.5mm mini-plug to monaural 2.5mm mini-plug adapter. Note: The TP-7 is recommended for cellular phones and landline phones. Note: The TP-7 will only act as a microphone. It will not playback sound. Note: When used with the DM-10DM-20, selct Monaural Input in the Menu for selection EXT. INPUT.