Philips Voice Tracer 7790, 288 h, 300 – 15500 Hz, 512 MB, LCD, 23 x 23 mm, Mini-USB B Philips Voice Tracer 7790. Maximum recording time: 288 h, Frequency range: 300 – 15500 Hz. Internal memory: 512 MB. Display type: LCD, Display size (HxV): 23 x 23 mm. USB connector type: Mini-USB B. Weight: 50 g