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iSimple IS31 Antenna Bypass FM Modulator for Factory or Aftermarket Car Radios

4.2 4.2 out of 5 stars 895 ratings

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Eligible for Return, Refund or Replacement within 30 days of receipt
This item can be returned in its original condition for a full refund or replacement within 30 days of receipt. You may receive a partial or no refund on used, damaged or materially different returns.

Purchase options and add-ons

  • Universal aux audio input for all FM radios
  • Simply flip the switch.Selectable operating frequencies 87.9 MHz and 88.3 MHz
  • Enjoy the clear, clean audio, Car radio aux input has a sleek, compact design
  • Antenna bypass FM modulator, Play almost any portable device directly through your radio
  • Audio connections and docking cables sold separately
  • Universal aux audio input for all FM radios
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Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here [PDF ]

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iSimple IS31 Antenna Bypass FM Modulator for Factory or Aftermarket Car Radios


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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 7 x 1.9 x 5.6 inches; 8.8 ounces
  • Item model number ‏ : ‎ IS31
  • Department ‏ : ‎ Electronics
  • Date First Available ‏ : ‎ May 15, 2009
  • Manufacturer ‏ : ‎ iSimple
  • ASIN ‏ : ‎ B002U5XPBE
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    4.2 4.2 out of 5 stars 895 ratings

Product guides and documents

WARNING:

CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

WARNING:

CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

Product Description

Antenna Bypass FM Modulator

Important information

Legal Disclaimer

I AM NOT A AUTHORIZED RESELLER I HAVE THIS ONE ITEM TO SELL FROM PRIVATE PURCHASE

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Customer reviews

4.2 out of 5 stars
4.2 out of 5
895 global ratings

Customers say

Customers like the quality and performance of the car FM antenna. They mention that it works perfectly and is universal. Customers also like the ease of installation. However, some customers have reported issues with the signal. Customers have mixed opinions on static, adapter, sound quality, and value.

AI-generated from the text of customer reviews

257 customers mention212 positive45 negative

Customers like the performance of the phone. For example, they say it works perfectly, has auxiliary ports, and works on any car radio with an FM receiver. They also like the fact that it is universal and adds the base line upon.

"...Much more of a pain than I expected originally but its working well with no complaints and its pretty much invisible, can't even tell its installed..." Read more

"I bought this product and installed it myself. It works great and was not terribly difficult for a novice (like myself) to install...." Read more

"...Worked perfectly!..." Read more

"...The regular FM transmitters all . . . perform poorly. This seems to work great...." Read more

205 customers mention183 positive22 negative

Customers find the installation process of the phone to be easy. They mention that they looked up on Youtube how to remove the stereo.

"...I wanted an inexpensive, easy, install and go solution to accomplish this, and this modulator delivers...." Read more

"...It works great and was not terribly difficult for a novice (like myself) to install...." Read more

"...Installation was fairly simple...." Read more

"Easy to install and leaves a clean factory dash" Read more

118 customers mention87 positive31 negative

Customers generally like the quality of the phone. For example, they say it's a great product, the build quality is great, and the sound is crisp. Some say that the quality is better than actually radio quality, and that the product is a very reputable brand.

"...My stereo works fine. All the connections are tight, and look fine. Changing my rating to reflect.Original Review:..." Read more

"...The IS31 is a great product and almost perfect. For someone that didn't have an auxiliary in, this has suited my needs well...." Read more

"...It sounded much better than the radio, almost CD quality. I was blown away by how well this sounded, so I bought one for my car...." Read more

"...obsolete with on demand devices, but it seems like it needs improvement in some areas...." Read more

254 customers mention165 positive89 negative

Customers are mixed about the sound quality of the phone. Some mention that the sound is crystal clear, and has not experienced any loss in FM signal. However, others say that the unit only gets about half as loud as a normal FM station, or other source.

"...I believe this is where my problem arrises. At first, the device plays crystal clear, without of trace of static...." Read more

"...I really have no interest in replacing this unit, as it sounds just fine, and I'd prefer to keep my vehicle looking stock to avoid the attention of..." Read more

"...Its also a bit quieter than your usual radio stations, even with the IS31 gain settings at max so you'll probably need to turn up the radio volume..." Read more

"...The volume gets nice and loud and there is no loss in sound quality.One thing I did which I think makes things a little easier...." Read more

63 customers mention38 positive25 negative

Customers are mixed about the value of the phone. Some mention it's definitely worth the price, while others say it' a complete waste of money/time. It installs easily, but has very cheap components and makes a whirling sound. It's useless and cost way too much for the 15 minutes it worked.

"...I wanted an inexpensive, easy, install and go solution to accomplish this, and this modulator delivers...." Read more

"I preferred to buy a factory wired aux jack but the cost was really expensive (2005 chevy malibu) After reading positive reviews for this I decided..." Read more

"...It does require some installation work, but it's definitely worth it. I have been using it for over a month with absolutely no problems...." Read more

"...All in all, 100% worth the price...." Read more

56 customers mention25 positive31 negative

Customers are mixed about the static of the phone. Some mention that it has little to no static, while others say that it constantly had some level of static. They say that the volume of the static rises in volume and that it fades to static after about 5 minutes.

"...However, after about 6-7 minutes, static starts to arise very quickly, so much so that about 15 seconds after the onset of the static, the music is..." Read more

"...The sound quality is great---no hiss, no static, no distortion, no muffling---just clear, clean music...." Read more

"...and they all have terrible audio quality, battery noise, and trouble fading in and out during a road trip. This thing is totally different...." Read more

"...There is a slight hiss, but zero static. Sound is clear but you can hear the drop in quality when compared to the CD player...." Read more

19 customers mention10 positive9 negative

Customers are mixed about the adapter. Some mention that it plugs right into the antenna, while others say that installation required two additional adapters, each costing about $17.00, and taking up space. Overall, the adaptor is a mixed bag, with some customers giving it a 4 out of 5 stars and others giving it 1 out of 5.

"I have 2004 honda accord. Work perfectly, no adapters needed. Sound good...." Read more

"...I'm tempted to give 2 or 3 stars over the lack of input cable. Seriously, why bother to sell this without a way to input your sound source?..." Read more

"...Since it completely bypasses the car's antenna, the sound is crystal clear, no static or interference...." Read more

"...The reason for the 4 stars is the hassle of getting atenna adapters for your car. Other than that, it is easy to install and sound quality is great...." Read more

40 customers mention11 positive29 negative

Customers are dissatisfied with the signal of the phone. They say that it interferes with the radio reception, cuts off the signal, and overpowers the antenna. The range seems to be decreased and the antenna was always too far away to be effective.

"...I did pick up a little bit of interference while driving at one point, very briefly...." Read more

"...Lastly, the antenna rendered one favorite FM channel useless as it goes in and out...." Read more

"...This provides a stronger signal than the cheaper Bluetooth FM modulator devices that plug into your cigarette lighter...." Read more

"...FM transmitters have a short transmission radius, the antenna was always too far away to be effective...." Read more

Like so many on here
5 Stars
Like so many on here
Like so many on here, my 2006 GMC Sierra did not come with an aux input or blue tooth. We also have a life time subscription to XM Radio, so I did not want to change the head unit. This fit the bill to a T. Read a lot of reviews and bought the following items:1) iSimple IS31 Antenna Bypass FM Modulator for Factory or Aftermarket Car Radios2) iSimple IS335 Dash Mountable Auxiliary Input Adapter3) Scosche Mda-Kb 1988 and Up Gm Micro/Delco Antenna Adapter Kit If you have ever put in an after market radio then this is a straight forward install. 2 wire splices and a lot of plug-n-play connectors. I tapped my radio's ground wire and amp-on wire for power. I also drilled my dash bezel for the switch and aux input. I could not be happier with the looks and sound of this system. It is exactly what I needed and now my poor wife can stop searching for "quiet" radio stations using those garbage fm modulator transmitters. Check out the pic for my switch/aux location.
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Top reviews from the United States

Reviewed in the United States on February 23, 2014
5 people found this helpful
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Reviewed in the United States on January 9, 2016
One person found this helpful
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Reviewed in the United States on June 9, 2011
2 people found this helpful
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Top reviews from other countries

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JamesDee
5.0 out of 5 stars It works, and it sounded great. Really cool iteam.
Reviewed in Canada on March 20, 2022
Amazon Customer
5.0 out of 5 stars Brilliant little device
Reviewed in the United Kingdom on June 26, 2017
SpForces
5.0 out of 5 stars 有線だから期待以上
Reviewed in Japan on November 28, 2020
One person found this helpful
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Ding Duck
5.0 out of 5 stars does as the name says 'Simple'
Reviewed in Australia on May 3, 2019
Gil Reyes
5.0 out of 5 stars Buenisimo
Reviewed in Mexico on September 8, 2016