Philips Voice Tracer 7780, 72 h, 300 - 7.500 Hz, 128 MB, 0.906 x 0.906" (23 x 23 mm), USB, Mini-USB B Philips Voice Tracer 7780. Maximum recording time: 72 h, Frequency range: 300 - 7.500 Hz. Internal memory: 128 MB. Display size (HxV): 0.906 x 0.906" (23 x 23 mm). Interface: USB, USB connector type: Mini-USB B. Weight: 1.76 oz (50 g)