Perhaps the most notable upgrade is the fact that the S711 can be powered by both batteries AND a power outlet. And like its predecessors, this recorder can handle dual speeds (2.4cm/sec & 1.2cm/sec), with the slower speed allowing for up to 180 minutes on an MC-90 tape. Included also with the unit is a built-in microphone that clearly captures audio, as well as a built-in speaker for playback anywhere and anytime. Additional features include fast playback (25%); external jacks for a microphone, earphones, and AC power; and voice activation.