The WS-831 Stereo Recorder is perfect for capturing notes, meetings or conversations. The WS-831 as an entry level WS recorder has an ample 2GB memory plus an in built microSD slot. It also has easily as much memory capacity as you will ever need (more than 500 hours) plus a super handy integrated USB stick to keep life extra easy. Dot matrix. Built-in memory 2 GB. Voice activated. Recording time 493 hours. Twin speed recording. 6 recording qualities. Stereo voice recorder. Dictation and conference recording modes. Slow_fast playback. A to B repeat function. 5 folders. Built-in microphone. Built-in microphone and speaker. Integrated speaker. Can be used as an MP3 player. Storage via Micro SD. WMA files can be transferred and played. Built-in USB connector. Microphone,. General information: Weight 51g. Size H10.1, W4, D1.5cm. Batteries required 1 x AAA (included). Manufacturers 2 year guarantee.