Low power, long 99.99 hours recording, 8GB storage, recording monitor hearing function, recordable over headphones when you are recording the same content, record up to 99 voice messages, MP3 / WMA and ADPCM format support, recording light can be hidden for secret recording, VOR voice operated recording function, HP / SP / LP / LI four kinds of recording function, telephone recording function, repeatedly play certain segment of a song, USB connectable for uploading and downloading voice files, built-in speaker.