Q8: What bitrate must the MP3 file be?
The module supports bit rates of 32 Kbps, 64 Kbps, 96 Kbps, 128 Kbps, 256 Kbps and 320Kbps for MP3 files. Other bit rates for MP3 files could cause problems with playback.
Q11: My computer isn't recognizing the board when I plug it into my computer
A11: Some micro USB cords can only transport power through them, so it is important to make sure the cable can transfer both power and data. In other words, some cables are only good to charge devices, but cannot communicate with them. First thing to do is test if the cable can not only charge, but also communicate with other devices such as a phone, if not try a different cable.
Q13: The sound files that I put onto my device won't play when using a Mac to put the sounds onto the device.
A13: Seems like some versions of the Mac add hidden files to the board that needs to be removed. In that case it is best to try a Windows computer instead. If you dont have a Windows computer please see this link that a customer wrote up about a past sound module that they used and that they used the same information to get this version to work with a Mac. Here Is a link to the article as well as the software that he mentions
Article - https://appleause.com/2010/09/29/ultraprojector-and-mac/
App - https://macpaw.com/cleanmydrive
Q14: Can it be constantly charged? In other words can you leave the USB plugged in?
Constantly charged is not recommended. Normally the battery can be fully charged within 1 hour when you use a 5V 1A charger.
Q16: Can the battery be charged through the USB port?