Features: Digital voice recorder and music player with high quality sound. One-touch recording, high efficiency for class, interviews, meetings, lectures, etc. High grade built-in microphone, allows you to record detailed conversations. Built-in rechargeable lithium battery, offers up to 20hrs continuous recording (fully charged). Supports 8GB/ 16GB/ 32GB memory card (not included). Small body, easy to carry and hide. Specifications: Color: Black Material: Metal Recording Format: WAV Music Format: WAV Playback Formats: WAV, MP3 Power Supply: Li-ion battery Recording Time: 20 hours (fully charged) USB Port: USB 2.0 Frequency Response: 20Hz-20KHz Working Temperature: 0~40 With Speakers: Yes Balanced Out: Yes Capacity: No capacity (supports 8GB/ 16GB/ 32GB TF Card) Compatible System: Windows XP, Window Vista, Windows 7, Windows 8 Item Size: 7 * 1.8 * 1.1cm/ 2.7 * 0.7 * 0.4in Item Weight: 34g/ 1.2oz Note: This digital voice recorder needs to work with a memory card (not included). Supports 8GB/ 16GB/ 32GB TF card. Package List: 1 * Voice Recorder 1 * Earphone 1 * Charging Cable 1 * User's Manual (English)