Features: Digital voice recorder and music player with high quality sound. One-touch recording, high efficiency for class, interviews, meetings, lectures, and more. High-grade built-in microphone allows you to record detailed conversations. Built-in rechargeable lithium battery offers up to 20 hours of continuous recording when fully charged. Supports 8GB, 16GB, and 32GB memory cards (not included). Compact design for easy portability. Specifications: 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°C to 40°C Built-in Speaker: Yes Line Out: Yes Internal Memory: None (supports 8GB, 16GB, 32GB TF card) Compatible Systems: Windows XP, Windows Vista, Windows 7, Windows 8 Material: Plastic Color: Black Package Contents: 1 x Voice Recorder 1 x Earphone 1 x Charging Cable 1 x English Manual Note: The package includes only the items listed above. Other items are not included. Due to lighting and display differences, the item's color in the photo may vary slightly from the actual product. Measurement error is +/- 1–3 cm.