One-key recording: automatic save, silent and lightweight, DSP+ noise reduction, MP3 playback, invisible pendant starts recording with sound, and stops recording without sound. After thousands of tests, voice-activated recording is more flexible and efficient, and it is very convenient to use. When the battery power is low, the recorder automatically saves the file and then turns off the power.Built-in time stamp: Built-in time chip, with automatic time synchronization function, record files are named according to time (year, month, day, minute, second), which can be used as legal evidence.Automatic encryption: The recording files are automatically encrypted and saved, preventing theft and making use more assured.Exquisite gifts: This is a wonderful Christmas gift for family, friends, students, etc.