Ideal for the business traveller who wants to travel light. The WS-311M saves all file types to its memory in an instant - voice files, music, presentations or text documents. With its 512MB of internal memory it allows you to store over 138 hours of recording time and the WS-311M is USB direct so no driver installation is required.<br><br>Backlight: Yes<br>Battery type: AAA<br>Dimensions (WxDxH): 38.6 x 11 x 94.8 mm<br>Display type: LCD<br>File type: WMA/MP3<br>Frequency range: 50 - 19000 Hz<br>Internal memory: 512 MB<br>Loudspeaker diameter: 1.8 cm<br>Maximum recording time: 138.5 h<br>Number of batteries supported: 1<br>Output power: 70<br>Weight: 47 g<br><br>512MB memory, easy to use centralised menu button<br>High quality built-in stereo microphone<br>USB mass storage device which allows storage of any file type, not just voice files<br>Hi-speed USB connection for fast up/download - plug and play<br>No specific software installation needed<br>6 different recording qualities for voice files<br>High quality WMA/MP3 music playing function with WOW/SRS effect<br>Long battery life:One AAA battery is good for up to 15 hours of continuous operation<br>Stylish, compact and light weight<br>5 folders for file management<br>Fast and slow playback<br><br><img src="http://gdetail.image-gmkt.com/387/717192796/2016/7/f176553e-f567-4f27-8740-f67eda16bd2f.jpg" undefined="" width="940" height="1410">