The new RS-31 footswitch now has four pedals for easy transcription. Connect to the serial or USB port of a PC for hands-free transcription convenience. For hands free dictation, connect to the docking station (DS-7000/DS-3500). The center or top pedal feature a lock release for user configuration and preference. Features: Connect to the serial or USB port of a PC for hands free transcription convenience Control Playback, Fast forward, and rewind with taking your fingers off the keyboard.