Up to 1,000 hours of recording time. Records in PCM, MP3 and WMA formats. Five acoustic modes for great recording quality. Voice activation. Integrated speaker and stereo microphone. Ports for external microphone and headphones. Built-in 4 GB memory. Can save music, dictation, still images, etc. Works as a mass storage device and music player. 1.43" backlit screen. USB port for easy connection/data transfer to a computer. Compatibility: Windows 8 (32/64-bit)/7 (32/64-bit)/Vista (32/64-bit)/XP (SP2) and Mac OS X 10.4.11 or later. Comes with a rechargeable NiMH AAA/LR03 battery (charged in the device). Size: 100x40x15 mm.