Its drawback is that it does not have a pause recording option while recording, like an older Olympus I had. It can record for 257 hours in its very sensitive microphone setting (TALK mode), but also for 506 hours in its slightly less sensitive microphone setting (MEMO mode). It is also good that it records in WMA format. It connects like a USB stick to the computer with a micro-USB cable.
Useful site: https://explore.omsystem.com/us/en/vn-541pc
For those who do not know, WMA is a lossless algorithm compared to MP3, which creates lossy files. This means that WMA recording media do not lose as many sound details as MP3. So, at the same bit rate of the file, WMA often has higher sound quality than MP3. However, playback of WMA files is mostly not supported on mobile phones, so conversion of WMA files to MP3 is required.

UPDATE 28/10/23: 1) Very positive is that it can record excellent sound quality while taking up very little storage space. For example, 50 minutes of recording in the most sensitive microphone setting (TALK mode - A total of 257 available hours for recording) takes up only 12 MB, while correspondingly, 50 minutes of recording in the slightly less sensitive microphone setting (MEMO mode - A total of 506 available hours for recording) takes up 6 MB.
2) However, a more sensitive microphone setting (TALK mode) does not mean better recording results when recording with such devices. If you want to record someone from (relatively) close distance, it is better to use the MEMO option, which actually gives excellent results, because otherwise, if it is in TALK mode, it will pick up a lot of background noise with the slightest sound, and then noise removal will be needed with audio editing software.