The TascamRC-3F foot switch is just perfect for the Tascam SD20M card player! The unit is built with a sturdy construction and is large enough to see what you doing while still playing an insturment! Made up of three switches, the centre one the largest for start/ stop action and the two smaller side switches for forward and back movements. However this can be altered to function controller in the record mode, which changes the switch actions. This is procedure is activated from the SD player. A long lead is supplied with the switch which is handy! There is a battery needed to function the switch, but will last a very long time. Tascam have decided to have a red light flashing when the switch is pressed, but underside switch of the switch were one can't see it, beats me. Very good switch in design and very well thought out.