There is not much to review with this product. It replaces a single AA battery. Just replace the battery with the AC powered substitute and you are all set. The power cable is six feet long. The attached wall wart is not too to large at about 2.25 inches long.
If you sell your clocks at Arts and Crafts shows this is a nice up-sell for your customers. If you give your clocks as gifts this really add a nice touch.
They also have one to replace C batteries.
The picture below shows the battery eliminator attached to one of my clocks.
DVD and the 2013 update DVD at this link. DVD #1 is $20 and contains over 1,100 patterns. The 2013 update DVD is $7.50 and has another 178 patterns. The 2014 update DVD is $7.50 and has 223 patterns.