External Memory : Yes With Speakers : Yes Record Audio Format : WAV Playback Formats : WAV External Microphone : Yes Package : No Balanced Out : Yes Voice Activated Recording : Yes Dimensions (WxHxD) : - Model Number : SK-007 Digital Voice Recorder 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: 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