This RS-27 footswitch is offered as a replacement footswitch for the one supplied with the AS-2000 series AS-3000 series or AS-4000 series Transcription kits. Control playback FF and REW without taking your fingers off of the keyboard! *Please note: the RS-27 does NOT come with DSS software required to utilize this footswitch. If you need DSS software with footswitch functionality we recommend you purchase the PC Transcription Kit (AS-2400) or AS-4000 Transcription Kit. Both kits contain a version of the DSS software that has footswitch functionality the RS-27 footswitch and the E-102 headset. We recommend the AS-4000 kit for business transcription. The DSS Player Pro software included in the AS-4000 kit is geared for someone who needs to track the progress of multiple files or customers such as in an office situation. The software provided in the AS-2400 kit is geared for someone who usually transcribes for one person. DSS Player for Mac supplied with digital voice recorders or with the AS-2000 series AS-3000 series or AS-4000 series Transcription kits will support the RS-25 footswitch. For DS-320 or DS-150 users you can download and install a patch to use the RS-27 with DSS Player 3.1 or 3.5. To download the patch click here.