Use this Microphone in conjunction with any iriver iFP 700 or 800 series player to record lectures speeches or voice notes. The microphone also has small attached clip so it can be attached to a shirt pocket or lapel for recording while the player is in your pocket. It is also identical to the microphone included with the H120 and H140 players. The head is approximately one inch tall and a half inch in diameter. The cable is 40 inches long. This microphone is compatible with the following players: iFP-900 series iFP-800 series iFP-700 series iFP-500 series H300 series H120 H140 Please note: This microphone only works with the players listed above. Other iRiver players are not able to use an external microphone for recording.