0ur opinion: :Tune in to full stereo sound from your portable music player, using your car's FM radio. Enjoy full stereo sound from almost any portable audio player by using the Monster RadioPlay Wireless FM Transmitter. MP3 players, CD players, portable DVD players and even laptops, you use these devices so you can enjoy your music and movies anywhere, anytime especially in your car. To listen to and share your tunes while you're driving, you need the right gear to make the connection. Just plug the RadioPlay into your car's 12v cigarette lighter and the mini headphone jack on almost any portable audio or DVD player. Then select a station on RadioPlay using the one-touch FM channel selector. Find the same station on your car stereo, turn on your favorite song and you're ready to roll. Your music transmits wirelessly to your car stereo using one of eight FM radio frequencies. With so many ways to get your portable audio, it would be a shame if you couldn't listen to all of it in your car. Share and enjoy every minute of your music and movies while you drive, with the ease and safety of the Monster RadioPlay.
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Testimonials
Average Buyer Rating:

Buyer's feedback: 
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* Does its job as well as one can expect ...
The factory stereo that came with my car has no AUX input in front or beneath the dash, and I don't want to spend a lot of money, time or effort ghetto rigging it when I plan to buy a new car soon. Thus, I bought this. It has several frequencies to choose from, but could be improved by having a full-spectrum scanner. The resulting sound is tolerable, albeit bass-heavy and (obviously) not even CD-quality.
For what it is, and because I had a gift certificate that made it free, it was a good buy. I only wish that I hadn't lowered my standards to buying it. Might not be worth the $20.
Buyer's feedback: 
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Sounds like the ocean
I bought this because my Chevy Blazer CD player is dying. I thought I could use it with an mp3 Player and it would save me carrying around a bunch of CD's in my car. What a mistake!. It transmits incredibly annoying waves of static every 2-3 seconds on all eight of the preset channels, none of which are in use locally. In a city where there are stations near those frequencies I'm sure it would be worse. Even my best MP3 players (Sansa e260 and Creative Zen) sound terrible unless running at near max volume and with the car stereo turned up to 8. Wasted money.
Buyer's feedback: 
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* it works, but sounds like radio ...
i can't compare this product to other fm transmitters because it's the first one i've ever purchased, but i'm not very happy with it. the product description on Amazon is accurate:
* Easy one-button FM channel selection with eight available channels
* Transmitter utilizes FM channels - 88.1, 88.3, 88.5, 88.7, 88.9, 89.1, 89.3, and 89.5
it is easy to use and the small size is nice so it doesn't take up much space in the car. although the cables get in the way. unfortunately, i didn't notice that it was limited to only those 8 radio frequencies before purchasing (oops). this is the biggest flaw with this fm transmitter (and i assume most will agree). because there are many radio stations in that 88.1 - 89.5 range in my area (St. Louis, MO) there is always audible static while using this device. it allows me to listen to all of my favorite songs from my mp3 player in the car, but it sounds like i'm listening to the radio and not a cd (like it should).
i can't even imagine why Monster would design a product to only allow you to choose from 8 frequencies. also, i'm not sure why this is called a wireless fm transmitter when you have to plug it into both your car lighter/electrical outlet and mp3 player. i guess since it's not plugged into the stereo that counts, but if you ask me, it is not truly wire-less.
this product is cheap and does what it's supposed to, but i would not recommend it to anyone. it is not worth the price (and i paid less than the $20 it's going for currently). and i hope that any prospective buyer will notice the things i didn't about this product.
Buyer's feedback: 
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Great price great product
I cannot speak for those who live near big cities, but this item works great in the suburb area where I live and sounds so much clearer than my older fm transmitter did and that one cost $50. It works in the 10 plus cars I have tried it in and it has no issue with my laptop sound or my ipod touch.
Buyer's feedback: 
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* Simple design, clear reception ...
This is a great product. I got it at a very reasonable price and have had no problems with it whatsoever.