Sharp RD-720H is a pocket-sized cassette recorder designed to be used with pocket computers. It features a tape counter reset button, a tape counter, a battery/record LED indicator, a pause button, a fast-forward/cue button, a stop/eject button, a record button, a play button, a rewind/review button, a monitor switch, a volume control, an external DC power supply terminal, an earphone terminal, a microphone terminal, and a remote control terminal.

With this device, you can record and playback audio, fast forward and rewind the tape, pause the playback, and adjust the volume.