Ideal for any phone conversations: When speaking on the telephone the TP-8 will capture both sides of the conversation for recording by your voice recorder. Just plug the TP-8 jack into the MIC jack of your recorder and put the earphone side into your ear. The TP-8 is recommended for both cellular phones and land-line phones including DECT standards. Ear pieces in three different sizes (S/M/L) are included.