Noisy on am
This adapter was noisy on am stations when used with the sony radio.
Found a generic at Radio Shack , however, that worked just fine and was quiet for about the same price.

Great, but some static interference
Product does everything it says. It does tend to have a little more static interference than just using it on battery power, but not all the time and not enough to make it annoying.

Alternative models for the Sony radio
After reading these reviews I decided to try a different adaptor for the Sony radio I purchased from Amazon. The first one I purchased from RadioShack produced the same type of interference as was reported by several people here. I returned that one and purchased a different model which works fine with the Sony radio and produces no interference. The model that works is RadioShack 273-1765. It is a 4.5 V - 700 mA AC-to-DC Adapter. This model costs $ 22.99.

Do Not Buy for AM Radio
Had same problem as others with this power supply as it imparts loud interference due to being a switching supply. It will not work with AM radios yet this is the accessory that Amazon lists for the Sony ICF-M410V portable radio. It even states this on the package but not in the ads.

Not compatible
The Sony AC-E45A AC Power Adaptor is presented as being compatible with the Sony ICF-M410V portable radio. The web site advertisment encourages you to buy the adaptor if you buy the radio by offering a package. Reality is that the adaptor causes the radio to have unacceptable noise and static. What is worse is that the notes on the reverse side of the Sony AC-E45A power adaptor carton say, "Do not use this adaptor with a radio as it may cause some noises." Obviously, had I been aware of the notes on the backside of the carton, I would not have purchased the adaptor and probably not the radio as well.