Built-in large capacity flash memory:Built-in flash memory helps reduce power consumption. The 880mAh battery provides 150 hours of continuous recording and 100 hours of headphone playback. It reads data directly from flash memory for fast transfer. The 16 GB internal memory can store up to 320 hours of recordings or 3,000 songs. It also supports TF card(Not included in package) up to 128GB. Voice Activated Recorder One Button Record/Backup: When "VOR" function is on, n Activates the recorder only when audible sound is detected, saving space and eliminating dead passages. With just one button, easily record/backup a recording file named with date and time. Effective recording for your speeches, meetings, interviews, lectures, etc. 3072Kbps Recorder: Portable recorder equipped with professional chip, built-in two noise reduction microphones, effectively reduce background noise, support recordings audio up to 3072kbps. Higher bitrates, better recording quality. Our recorder is also equipped with high quality Hi-Fi stereo speakers for super clear recordings without headphones. Files are recorded in MP3/WAV format. Easy file management: Recordings with date (file name with year, month, day, hour and second) , easy to know the date. This digital voice recorder comes with a USB cable, you can use it to connect your computer to charge and transfer files. Our recorders can be connected to Windows and Mac (for Mac connection, please use the usb-c to usb-a cable, the supplied cable is USB 2.0 Type A). Multi voice dictaphone -operation:Set a 4-digit password to protect your personal files and prevent others from viewing them! Additional functions include: A-B Repeat, Variable Speed Playback, Timer Recording, Subsection Recording, Speaker Playback, Low Battery Protection, etc. Everything is conducive to improving your learning efficiency and saving more time.