Instruction: Answer the given question using the supporting document.

Input:
Question: Will this work on an iPhone 4s using the otterbbox case for iPhone 4s?
Document: If they were consistently what Wirester sells, I would give them 4 stars. In order to get the 5th star, they would have to be as thin as the newer iPhone headphones (iPhone 4/4s) to work with the Lifeproof case. Admittedly, that's not what these things were designed for, I'm sort of hacking/inventing uses for them.
If you are using Kinps battery case and an iPhone 5S, forget it. It doesn't really work for what I needed it for. Waste of time/money.
This definitely extends then length so that you can fit a right angle headset jack into an iPhone case. I just don't think saying it's "compatible with the iPhone" is reasonable. None of the controls on your headphones will work. You can't answer a call or hang up using the button on your head phones.
Ordered this item because my iphone 4s case wouldn't allow a perfect fit for my Monster Beats by Dre headphones. The item itself works PERFECTLY as described. Problem is ... the inline mic/volume controller will NOT work. I can't skip songs now or pause/play. That's really unfortunate because this is exactly what I needed to get my headphone connection working good. Its still a good product but without being able to use the ControlTalk buttons I'm probably only going to use it while working out.
Exactly as advertised. Slim pin adapts cord to allow it to fit into iPhone 4s with case on. No complaints.
This does not work for iPhone controls. Using this extension piece eliminates the usage of your iPhone headphones buttons for volume, skipping tracks, pausing, etc. It only works for transmitting the sound. This is disappointing and makes it something that's not really worth using.
this is so nice to have on hand for using the headphone jack while keeping cases on devices. I used it with my iphone 4 while in the SPEC case.
i am using a apple leather case with my iphone 5 and this allows me to plug in my headphones without taking it out of the case. works with my beats.
My husband has the Pelican ProGear Vault case for his iPhone 5 and it did NOT come with a headphone jack adapter, like other water resistant cases do. Unless he's using the official Apple headphones that came with the iPhone itself, no other headphone plug would fit.
This lets me play music on my iPhone 5 (while in a waterproof case ) in the car using the Monster iCarPlay Cassette Adapter 800 for iPod and iPhone. Love it! I can charge my phone while it's inside the Seidio Waterproof  Case no problem using the apple charger but couldn't find a cassette adapter with a connector slim enough to slide in through the waterproof case deep enough to connect. This extender has a point that is as slim as my apple issued headphones and so solves my problem. :) Yay!
Answer: Works with my 5s in an otter box case, only one that did.