4GB or 8GB or 16GB or 32GB or 64GB Digital :The portable digital recorder comes with 64GB of memory and can store up to 750 hours of voice data. You can record up to 30 hours of HQ recording on a full charge, which means you can record for a long time. You can also record while the battery is charging, so you do not have to worry about not being able to record in an emergency. Mini Metal Keychain Spy Recorder:The (2.5x1.0x0.5 inch) design makes it more portable and concealable. It can be placed in your bag or pocket, so you can carry it around and record it at any time. The keychain design means you can easily hang it on your body, bag or notebook. It can be used to record meetings, interviews, business meetings, or for student memory lectures. HQ Recording and Intelligent Noise Reduction:The portable digital recorder have an HQ recording microphone and intelligent dynamic noise reduction, making it easy to enjoy clear recordings and playback. The professional voice recorder uses PCM digital noise reduction technology for noise- recording and 360 panoramic recording to give you clear natural sound. One-Key Operation and Multi-functional Playback:One Touch Recording, press the record button to start recording. You can take it out of your bag or pocket and start recording the right way. You can also save your recordings quickly. The recording date and time settings allow you to see the date and time of the recording. You can split files that have been recorded for a long time for better management.