Casio AD-5 AC Adapter for Casio Keyboards Review

I have a very old Casio "Bank Tone" CT-636 portable keyboard.The AC adatpor was lost and I've been using size D batteries for my son to play the keyboard and that was getting expensive.Finally searched online to find a replacement AC adatpor.According to the spec at the back of my CT-636, it says "DC 9V, 4.5W, uses AC Adaptor AD-5".9V 4.5W translates to 500mA.
I found two such AC adaptor links on Amazon.One says AC Adatpor AD-5.Another says AC Adatpro AD-5MR (9V, 850mA). Since I didn't want to deviate from the spec and the product description for the AD-5 on Amazon included my model (CT-638/CT-636) while the AD-5MR didn't, so I ordered the AD-5 (~$19+shipping) even though it was almost $10 more expensive than the AD-5MR (~$11).
The delivery was super fast.I got the AC adatpor 2 days later.HOWEVER, this AC adaptor shipped is actually the AD-5MR (9V, 850mA)!!I plugged it into my CT-636, yes, it works, but had I known they are going to ship me the AD-5MR anyway, I would've order it $10 cheaper!!So i was not happy about that.
I gave it 4 stars for the fact that it works.

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Product Description:
The Casio AD5 lets you save the batteries for when you're away from home!The AD5 plugs you into endless hours of playing, not to mention saves you a bundle on batteries. This high quality adapter is designed specifically for your Casio keyboard. Input: AC120VThe AD5 Works with the Following ModelsCTK-431CTK-451CTK-471CTK-481CTK-491CTK-495CTK-496CTK-520LCTK-531CTK-533CTK-540CTK-541CTK-551CTK-555LCTK-560CTK-560LCTK-571CTK-573CTK-574CTK-591CTK-593CTK-611CTK-620LCTK-631CTK-651CTK-671CTK-691CTK-700CTK-731CTK-800CTK-900LD-50LK-30LK-33LK-40LK-42LK-43LK-45LK-50LK-55LK-73LK-90TVLK-94TV

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