More ridiculous USB solutions to the mundane. If you're bored of your usual ding-dong every time someone calls at your door then you can change things with this USB Doorbell from ThinkGeek. Use the USB to upload any audio you like from your computer, but please don't be one of those neighbours who goes all Christmas themed and plays jingle bell rock. Seriously.
Unfortunately this isn't battery powered so you'll need an existing wired doorbell to replace. It's also $99.99 but if you have any miserly friends it might be the perfect gift to terrify the neighbourhood kids playing knock-a-door run.
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