This voice activated Sony Dictation Machine has a 4GB memory totalling to a possible 1073 hours recording time. Built-in memory 4 GB. Voice activated. Recording time 1043 hours. 99 folders. Built-in microphone. Built-in microphone and speaker. Can be used as an MP3 player. Microphone, . General information: Weight 72g. Size H11.52, W3.85, D2.13cm. Batteries required 2 x AAA (included) .