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

4.2 out of 5 stars 895

$29.87
FREE Returns
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.
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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
See more product details

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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 out of 5 stars 895

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 performance and ease of installation of the phone. For example, they mention that it works well, and is fairly easy to install. Customers are also satisfied with the value. That said, some complain about distortion and gain adjustment. Opinions are mixed on sound quality, quality, and static.

AI-generated from the text of customer reviews

278 customers mention228 positive50 negative

Customers like the performance of the phone. They mention that it works well, sounds perfectly clear, and functions normally. Some say that the inexpensive device works great and gave their sound system a new life. Overall, most are satisfied with the performance and functionality of the product.

"...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

"...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

"...Worked perfectly!..." 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

202 customers mention184 positive18 negative

Customers find the installation of the phone fairly easy. They mention that the wiring is pretty easy if you're a DIY king.

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

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

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

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

48 customers mention41 positive7 negative

Customers like the value of the FM modulator. They mention that it is a great buy, with superb quality for a minimum price.

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

"...It's definitely worth the price. However, I had to knock off a star because it seems very susceptible to interference...." Read more

256 customers mention168 positive88 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. They say the device preserves more bass from the audio signal, and there is no noise or static when it is connected and tuned to the radio. However, others say that the audio quality is reduced, the volume is slightly decreased, and it's a bit quieter than your usual radio stations.

"...directly into the antenna input on your stereo head unit, the sound quality is superb...." 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

"...of the reviews said that it would be no problem, and that it sounds pretty decent, so I figured I would buy her an early Christmas present and..." Read more

100 customers mention50 positive50 negative

Customers are mixed about the quality of the phone. Some mention that it works as advertised, has decent quality, and is almost CD quality. However, others say that the hardware quality does appear to be sub par, the range is limited, and the product is not very heavy duty. Additionally, some customers also mention that the product decreases the quality stations near the set frequency when it's on.

"...This little unit is a great device to add an input to your factory stereo...." Read more

"...tape route for a brief period of time, only to find it to be largely unreliable. So I decided to keep looking...." 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

"...my experience, this product serves its intended purpose, but is not without flaws...." Read more

60 customers mention27 positive33 negative

Customers are mixed about the static. Some mention that the sound is crystal clear, with no static or interference. However, others say that the volume is reduced by 30% and constantly has some level of static. The static starts to arise very quickly, and it adds static to every station.

"...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

"...I can't hear any static even with broadcasting silence (no signal) with the radio volume turned up to more than 75%...." Read more

"...It turns out the unit was faulty (it faded to static after about 5 minutes; you should be able to hear the stations in the background when the unit..." Read more

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

43 customers mention8 positive35 negative

Customers are dissatisfied with the distortion of the phone. They mention that it interferes with the signal, reduces the signal strength, and degrades the reception. The reception degraded beyond what was acceptable, and the output signal can overpower any frequencies within a couple MHz of the device.

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

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

"...The main issue is that when the iSimple is on, it reduces the signal strength of ALL radio stations, not just the frequency you've selected on the..." Read more

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

21 customers mention5 positive16 negative

Customers are dissatisfied with the gain adjustment of the phone. They mention that it wouldn't go high enough to match over the air stations, it's tough to get the gain just right, and the range of the gain is barely adequate. Some say that the knob was broken.

"...calibrating sound levels between multiple devices, it is tough to get the gain just right. Adjust it too high, and everything will pop...." Read more

"...You do have to crank up the gain, at first I had to have the source and radio both nearly full volume to get moderate sound...." Read more

"...My only gripe is that the gain would not go high enough to match over the air stations...." Read more

"...It broadcasts to two selectable frequencies (87.9 and 88.3) and installs between the vehicle's antenna and the car stereo...." 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 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