This new microphone / earphone allows you to record conversations from your cell phone when connected to most standard recorders. Simply insert the plug of the cell microphone into the mike jack of your tape recorder and insert the mike pickup (With foam pad) into your ear. Set your tape recorder in the "record" mode and the voices of the call as well as your own will be clearly recorded. Now you can eliminate the danger of trying to write messages, orders or directions while driving. Simply tape them and play them back later. No need to fumble looking for a pen and paper! The compact design of this earphone microphone allows you to record call from cell phones, pay phones and cordless telephones. Works wonderful with Panasoic Sox Hour Long Play Micro Recorder as desscribed below. Specifications 3.5 mm input jack- 2.5 mm input jack (included) - Weighs 12 grams.