Stored at home and used infrequently. Records for 12 hours on a single AAA battery. Small size, just 10cm tall and 3cm wide, making it highly portable. Operation confirmed, audio quality is good. Formatted, lightly cleaned, and will be shipped immediately. Recording file format: MP3 Playback file format: MP3 Frequency response (L): 20Hz Frequency response (H): 20000Hz Sampling rate: 44.1kHz/192kbps Memory capacity: 1GB Number of built-in microphones: 2 External microphone: Supported Automatic recording: Supported USB direct connection: Supported Battery type: AAA x 1 Battery life (recording): 12 hours Battery life (playback): 34 hours Thank you.