Editorial Review:

Product Description:
While downloading images to your computer, you can save your batteries for the road by using the CoolPix AC adapter. Downloading photos takes lots of juice, so save it for when it's really important: capturing those precious moments on digital film.

Amazon.com Product Description:
This Nikon Coolpix 990 AC adapter allows you to power your camera from an AC outlet instead of using batteries. Use it with a power source of 100 to 240 volts and 50 or 60 Hz.

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Rating: - Incompatible Adapter/Battery Charger EH-31
Page 163 of the Nikon CoolPix995 camera guide states that "The AC Adapter EH-31/30 cannot be used with the CoolPix995." The foregoing statement appears under the paragraph explaining the use of Nikon AC Adapter/Battery Charger EH-21.

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Rating: - some things to consider first
I didn't read anything about the need to remove the batteries while using the adapter with the instruction that came with the adapter. There was a warning about not using the adapter too long or else it might over heat the camera, but it didn't specify what "too long" is. The AC cable that came with the camera is only good for either 120 or 240 volts. You MUST use different cables for different voltages. My recommendation is to spend your money on getting more rechargeable batteries intead of buying this adapter. Make sure you get batteries with 1600mha ratings.

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Rating: - Does What You Expect of It
The Coolpix 990 AC Adapter does just what it is supposed to do, which is to allow you to use your camera for as long as you wish without having to worry about batteries running down. This is especially important when downloading files to your computer. You can travel abroad with it as it works on 100-240 volts, 50 or 60 cycle AC. My only quibble is not with the adapter, but the camera circuitry, which requires that you remove the batteries when using any AC adapter. It will not recharge them, but might cause the batteries to overheat (according to Nikon).