Does it need external speakers?

No. It has built-in speakers, so it plays records on its own. You can add external speakers later if it has an output, but the built-in ones are the starting point.

Can I play 45 RPM singles?

Yes. It supports both 33 and 45 RPM, so albums and 7-inch singles both play at the right speed.

What does Bluetooth do on it?

It lets you stream audio from a phone or tablet through the player's speakers. It is not a Bluetooth transmitter for sending the record to wireless headphones on most units of this type.

Is it good for a beginner?

Yes, for casual listening. Setup is simple and everything is in one box. If you plan to collect seriously or upgrade parts, a separate turntable and speakers give better sound.

Does it have a headphone jack?

Many 10-in-1 players include a headphone output for private listening. Check the connections on the unit before buying if that matters to you.

Can it record vinyl to a computer or USB drive?

Some 10-in-1 players can convert records to digital files over USB. Confirm the specific conversion feature on this model, since the modes vary between units.