Digital voice recorder with MP3 player functionality Real-time clock display One-key lock screen function High-quality built-in microphone for clear studio-grade recordings Capable of recording telephone calls when connected to a telephone line Automatic recording activation with sound detection; pauses when no sound is present Supports external audio playback through speakers for loud, high-definition sound output Loop playback and sound mode selection options Built-in USB function for easy file transfer; acts as a removable drive Automatic file saving during recording to prevent data loss One-button recording for quick and simple operation AB repeat function for convenient playback control Plays MP3 and WMA audio formats Integrated clock function High-capacity 220mAh polymer lithium battery, environmentally friendly Low battery indicator提醒