A few days ago I bought this:
[img width=144 height=256]http://i289.photobucket.com/albums/ll222/mumboking/Photos/DSC_0297.jpg[/img]
Original postIt seems the problem it had was that the internal battery had corroded. Some of the button contacts were bridged with corrosion.
I managed to clear most of the corrosion, so now it's not beeping at me all the time.
I had to remove the battery, resulting in this becoming a "plugged in only" device.
Unfortunately, two of the buttons don't work, even after repeated cleaning: Q and Z. :'(
Q doubles as 1 and Z doubles as ".
I think the corrosion has eaten the traces away. Makes entering the date impossible.