How do I pair my headphones to my Nextbook? - Nextel Radio Communications

Set the country code to your country.

Pairing Press and hold for about 2 seconds to switch on your headphones. The headphones beeps, and the Power / Pairing Indicator lights green briefly. If the headphones have not been previously paired " with a device, they automatically enter pairing mode and the Power / Pairing Indicator flashes blue quickly.
https://www.manualslib.com/manual/1205621/Auvio-3300675.html

Are these bluetooth headphones? Do they connect to other devices?

You probably need the DRIVER for the headphones (from that manufacturer's website) to be loaded on to the Nextbook.

The first thing you'll need to do in order to pair your Bluetooth headphones is to make them discoverable. Turn on your headphones and press the Bluetooth discovery button. On AirPods, it's the small button on the back side of the case.
While your Bluetooth headphones are discoverable, say, "Alexa, pair my [Name] headphones. If everything is ready, Alexa will automatically pair with your headphones and you're ready to go.
If you're not in a situation where you can or want to talk to Alexa, you can manually pair your headphones. You're going to need to actually touch your Amazon Echo Show screen for these steps, which is nice because ... you know, it's a touchscreen.

1. Swipe down from the top of your Echo Show screen and then tap Settings.
2. Tap Bluetooth.
3. Select your headphones.

Your headphones will pair with the Amazon Echo Show and audio will begin streaming to them instead of the built-in speaker.

I don't think you can. Your battery would last 15 minutes.
Also There would have to be an amplifier in your nextbook which is hardware and unlikely to be there without it being mentioned by the manufacturer.
Sound comes from the 3.5 mm analog headphone port which takes milliamps of power.

I don't think you can pair two devices at the same time. You will have to pair one at a time . On the phone go to connections and bluetooth , switch bluetooth on and make sure it is visible. Press scan for devices .your headphones should be shown in list if they are set to visable .press pair and a option to put in a 4 digit code willcome up type in a code and put same code in the headphones and press pair these devices. Do the same with the ipod but type in a different code and put code for ipod in headphones pair devices . You should be able to listen to either one

How old and what type are the headphones?
The Jack part(plug) may be bad or wires by the individual phones as well. to test-try bending either end in a small loop and see

there a few. free apps for this using play store the problem is the built in speakers may not do it so it sounds crackly,one fix I saw was using the equalizer and turning up the bass.I have not tried this yet,they recommend headphones hope this helps

You have to have headphones that are equipped for that device. I use Apple headphones for my Nextbook 7Premium Android device. It depends on what type of headphones you are using? You also have to push hard on the piece that goes in. Sometimes they don\'t go through so you won\'t be able to hear at all.

The Insignia headphones must be set to "pair".

With the headphones off, press and hold the power button on the headphones until the logo starts blinking red/blue. You are now in "pair mode". Have your Touch look for bluetooth devices and it should see it now.

Hope this helps!