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How to Add Bluetooth to Stereos with Aux In Port

The AUX-IN port on your stereo is the secret to a Bluetooth Upgrade.  CoolStream Duo will modernize your older stereo system to a Bluetooth stereo in minutes.  A built-in rechargeable battery and an AUX jack for audio out will have you streaming music from Spotify, Pandora, Apple Music, or Amazon music in minutes.  Let the Duo transform your older great-sounding stereo into a Bluetooth Enabled great-sounding stereo for $24.99.

The AUX In found in Kicker stereo speaker let you stream music from your phone with the CoolStream Duo.
Check your older stereos for an AUX IN port!

Here’s how to do it.

  1. Check your stereo for an AUX-IN port.
  2. Charge your CoolStream Duo.
  3. Switch the top button over to the LEFT to activate the battery.
  4. Connect the Duo to your stereo with included 3.5 mm AUX cable.
  5. Pair the Duo to your phone.
  6. Set your stereo to the AUX input setting.
  7. Play music from your phone.
  8. Tell all your friends.

Here’s how it works.

CoolStream Duo Bluetooth receiver has a rechargeable battery that can be recharged with any iPod charging cable.
Recharging the Duo is easy.
Connect it to any iPod charging cable.
Cool and Easy.


The 30-pin iPod connector is how the Duo gets power.  On a dock, it powers up when the dock is plugged in.

No dock, no problem.

Use any 30-pin iPod charging cable to charge the internal battery with AUX-In ports in stereos and cars.


The top of the Duo has an AUX Jack for Audio out to your stereo.  The Duo comes equipped with a dual-tipped 3.5 mm AUX cable so you can connect your older stereo to the Duo right out of the box. (An iPod 30-pin charging cable is NOT included with the Duo.)


CoolStream Duo Bluetooth receiver has a rechargeable battery and an AUX jack for music streaming on any stereo or car with an AUX-In port.
Slide the switch to the left to activate the Battery.
Use the AUX Jack to connect to any stereo with an AUX-In port.
Very Cool, Very Easy.


All the pieces needed to keep your Duo ready to use with an Aux enabled stereo.





















We have assembled everything you need to keep your Duo charged and ready to use with an AUX port.  Please contact us to order the Bluetooth Aux Kit.

The 3.5 mm AUX cable that comes with your Duo does NOT provide any power.  It is purely for sending your music to your stereo.  You need to charge the Duo’s battery periodically (1-2 hours of charging = 4-5 hours of streaming) or leave the Duo on the charging cable.  The Duo is equipped with overcharge protection, so please leave the Duo plugged into a charging cable indefinitely.

The CoolStream Duo can be connected to any Stereo AUX-In port using the dual-tipped included cable while charging at the same time.

Once you have everything plugged in and paired to your phone, don’t forget to choose the AUX setting on your stereo.  If your stereo has an AUX port, it will have an AUX setting.

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