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FiiO E02i Rocky Headphone Amplifier for iPhone 3GS, 4, 4S, 5

3.5 out of 5 stars 32 customer reviews
| 9 answered questions

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  • Get enhanced audio output from an iPhone, along with switchable bass boost. Lossless bass boost circuit design realizes natural sounding and strong bass effect.
  • The E02i provides all of the line controls for music and phone calls on the iPhone, including play, pause, change tracks, and answering calls
  • The built in lithium ion battery lasts for up to 10 hours of normal use. In case the battery runs out, the bypass feature allows the E02i to continue function normally without the amplifier feature.
  • An aluminum shell not only looks fashionable and is durable, but also fully shield external interference to prevent noise.
  • Use any headphones to make calls on an iPhone with the E02i's microphone. Located on top of the E02i, the high sensitivity microphone is designed for clear conversation and low noise.
Currently unavailable. We don't know when or if this item will be back in stock.

Technical Details

  • Brand Name: Fiio
  • Model Number: E02i

Product Description

The E02i is a versatile headphone amplfier and remote control unit that is compatible with iPhone 3GS, 4, 4S, and the new iPhone 5. Built upon FiiO's industry leading portable headphone amplifier technology, the E02i is compact yet delivers an exceptional level of audio performance.

Audio Impact
Get enhanced audio output from an iPhone, along with switchable bass boost. Lossless bass boost circuit design realizes natural sounding and strong bass effect.

In Control
The E02i provides all of the line controls for music and phone calls on the iPhone, including play, pause, change tracks, and answering calls.

10-Hour Battery
The built in lithium ion battery lasts for up to 10 hours of normal use. In case the battery runs out, the bypass feature allows the E02i to continue function normally without the amplifier feature. Full Metal Shell
An aluminum shell not only looks fashionable and is durable, but also fully shield external interference to prevent noise.

Built-In Microphone
Use any headphones to make calls on an iPhone with the E02i's microphone. Located on top of the E02i, the high sensitivity microphone is designed for clear conversation and low noise.

Specifications
Output Power: >70mw (32Ohm) Headphone Impedance: 16~150Ohm
Frequency Response: 20Hz~20kHz
Power Supply: USB 5V/500mA
Size: 0.9"x2.3"x0.6" (including clip)
Cable Length: 31.5"
Weight: 27g

Product Information

Product Dimensions 2.2 x 0.8 x 0.6 inches
Item Weight 0.8 ounces
Shipping Weight 2.1 ounces
Manufacturer FiiO
ASIN B0091CWYQ6
Item model number E02i
Customer Reviews
3.5 out of 5 stars 32 customer reviews

3.5 out of 5 stars
Best Sellers Rank #522 in Electronics > Car Electronics > Car Audio > Amplifiers > Multichannel Amplifiers
Date first available at Amazon.com September 22, 2012

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Verified Purchase
This little device is a home-run on too many levels.

The amp is not super powerful, but works perfectly to help boost sound for headphones. The difference with or without this amp is very noticeable. It's small and feels like a quality product in your hand. It charges full in about an hour, and lasts for almost 8 hours on the same charge! The microphone makes it easy to take calls when I am listening to music, and having volume and play controls directly on the amp is simply genius.

Truly, a great product for anyone who wants great headphones for a smartphone.
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Verified Purchase
I've been using this microphone / remote control headphone adaptor on my iPhone for several months now and it's great. It's well built, easily controls my phone, and has a decent microphone. The housing is a solid metal tube. The cable is rugged (though it has one flaw I'll mention later). The clip works under most conditions without marring your shirt (or whatever you may clip it to). The controls are solid and easy to use. But the best part is that this is also a FiiO amplifier (with its own USB rechargeable battery). That's a nice plus for a junior audio snob like me. I'd been looking for a solution to pair with my awesome Audio-Technical ATH-EW9 headphones and this was the first adaptor that didn't look flimsy. And it's not. Everything about it is sturdy and because it's a FiiO amplifier the sound in your ears doesn't suffer like with other unpowered adaptors. One warning, which the instructions mention but I will reiterate: Always remember to turn off the amplifier before you unplug it from your device. If you neglect to you'll blow out your eardrums and or damage your headphones. The action of unplugging can cause a signal spike which will be pushed through the amp and into your headphones. This is true of almost any amp, so it's not a minus, just a caution.

So, that's everything I like about them. There are two things that keep it from getting 5 stars. The minor one is that the Rocky is hefty. I'm used to it now, but at first it felt like it was pulling my shirt collar down. So you may need to click it in a different location than you normally would. The second is that while the jack is very solidly built, it has no stress relief for the cable.
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Verified Purchase
This product does what it is supposed to do, amplify the volume of your iPad or iPhone. I use this frequently, and don't notice a change in the quality of the sound. The extra base adds good depth, but does not block the treble. The battery has great life to it. I bought this due to no other good options to solve the volume problem, and based on good reviews on Amazon. The good reviews were correct, and would recommend this product highly.
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Verified Purchase
I know already a lot of good things has been written for this nice piece of art. My only 2 cents
1. Buy it, you will not regret it)
2. Not advisable for driving with High Impedance ear speakers like HD 700 or T1. At least I did not find any noticeable difference. I generally use it with Bose, and it does a nice job.
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Verified Purchase
A great item for the motorcyclist. This unit amplifies the levels enough to overcome wind noise. Ideal for In-Helmet speakers. The unit can be used for many hours or days before requiring to be recharged. Most Bluetooth devices only work for several hours.
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I really like the amp. For the money and what it does, it's terrific. Terrific that is, when it works.

I've now owned two of them. The first one ended up having periodic static. This had nothing to do with my headphones, or my iPhone 5, the connection, the file being played, external factors (e.g., wet environment) or anything else. It was simply an internal problem with the device electronics that would happen from time to time.

I returned the first one and got a replacement. After a few weeks it developed the same periodic static problem. I kept it anyway because I liked the amp so much I felt I could live with some static once in a while. Then after a few months something else happened so that now periodically the left or right channel goes out. It seems to depend how the thing is tilted and if I tilt it one way or the other sometimes I get both channels back. It's now worthless to me.

I don't bang it around. It just goes in my pocket and is treated rather delicately. I find it hard to believe I had such bad luck that I received two defective products in a row. just think the build quality is bad and its electronics will go pretty quickly.

A shame really because when it works its nice. But I suggest waiting for a better solution to come out.
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Verified Purchase
I love this! I have purchased many headsets for my iPhone, and have always had complaints from people I'm speaking with that they can't hear me or it crackles. I have had no complaints and people are able to hear me loud and clear. They can be used with any standard headphones which is another nice feature. The only complaint I would have about this is I have found wire management to be difficult, but I think I have figured it out.
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