The battery of the Sony NW-E394 cannot be replaced by the user as the device must be dismantled for this. It is recommended that you contact customer service for a replacement.

No

No memory card can be inserted

Hello, no there is no bluetooth connection A wireless headset is not compatible

No, this device does not have speakers. This is not mentioned in the user manual.

Yes, this question is justified, I also think the device must be returned, but the packaging no longer supports this. in principle, an old mobile phone would also serve for this purpose, I am currently testing this out should have asked better before

Well I am not sure what is the reason for such a product, would it not be better to use a smartphone to play back music? There are tons of applications to choose from and yes it may be a bit bigger but the functionality would be much more enhanced, e.g. it could also be used as a GPS. And you get a ton more of storage space too. As an example, the Redmi 9c would come with 32 GB of storage, has MicroSD expansion capabilities and a huge 5000 mAh battery. Xiaomi Redmi 9C (32 GB, Twilight Blue, 6.53 ", Dual SIM, 13 Mpx, 4G, 3G, 2G)

Yes, no problem. Always do it like this

Usually yes. Mac OSX accepts it as a kind of usb stick. So it should work :-)

In one of the product pictures we can see headphones. Also, this "unboxing" video shows headphones. https://www.youtube.com/watch?v=BbjsB8iG-A0

Yes, this mp3 player is compatible with the headphones mentioned below. The 3-button remote control built into the headphones will not work, however, as it is designed to work with Apple devices using IOS.

Absolutely. The price is slightly different in red because the purchase price from the supplier differs depending on the colour of this item.

Yes, it is possible to listen to FM.