Not sure about and iPhone 5, but it fits without any problems in an iPhone 4

It should fit, but really depends on the 3.5mm cord thickness.
If its straight and slim cord then yeah should be no problem.

The SIE2 headphones have a straight and fairly skinny input connector. If other headphones fit in your phone's headphone jack with this case, you should not have any issue connecting the SIE2's. Thanks for your inquiry.

I believe there is an extension, but I would recommend going to a bose outlet to check.

We're happy to hear you're enjoying your headphones. While the SIE2i's are designed for Apple products such as iPhone, the microphone will typically work with Android phones (including the Note 3) without the use of an adapter. Keep in mind the volume controls will only work with certain Apple products. For any further questions, please contact our technical support team who can assist. They can be reached at 1-800-380-4831 and are available 8:30am-10:00pm M-F, 9am-7:00pm Sat EST. Thank you.

The SEI2 is more expensive and has controls on the wire to allow pause, play selection and volume control. Since I use these for running, I tend to set it and leave it. It easn't worth the extra money for me.

Thanks for your question. The pocket dimensions of the armband are 4 7/8" W x 2 5/16" H x 5/16" D. We hope this helps!

Yes - S, M, L.

Thank you for your question.

The MIE2i headphones include three different sized silicone tips. The Medium tips are pre-installed on the ear buds and both Small and Large pairs are included in the packaging.

Mainly two things:

1 - These are water/sweat proof.
2 - The wiring, plug, and connectors are designed to support for sport activities while wearing them.

Our SIE2 Sport Headphones are designed with the exercise enthusiast in mind. While they feature the same audio performance as our In-Ear line of headphones, they offer increased durability and resistance to moisture. Additionally, SIE2 headphones come with an exclusive armband that will hold most portable music devices.

Thanks!

I think it is primarily meant to run on iOS. But I've heard it has run on some android devices.

Thanks for the question!

The volume Up/Down controls on the SIE2i headphones are intended exclusively for select Apple products and will not work with any other device. The Call Answer/End button control may or may not operate properly on an android phone. This functionality varies from model to model. (Audio playback should work normally from any device that a 3.5mm jack.)

Yes.

The SIE2 and SIE2i headphones are both fully compatible with the iPhone 4. The SIE2i version also features an inline microphone and volume controls.

Thanks!