bells and whistles

plural noun Informal.
features added to a product; special parts or functions; extras.

1970–75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bells and whistles
pl n
1.  additional features or accessories which are nonessential but very attractive: my car has all the latest bells and whistles
2.  additions, such as options or warranties, made to a financial product to increase its market appeal
[C20: from the bells and whistles which used to decorate fairground organs]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

bells and whistles definition

(By analogy with the "toyboxes" on theatre organs). Features added to a program or system to make it more flavourful from a hacker's point of view, without necessarily adding to its utility for its primary function. Distinguished from chrome, which is intended to attract users. "Now that we've got the basic program working, let's go back and add some bells and whistles." No one seems to know what distinguishes a bell from a whistle.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Digital cameras come with lots of bells and whistles.
Today's operators often use high-tech bells and whistles to lure their prey.
Because the reality was, guess what, bells and whistles don't go off all day
Fancy bells and whistles are great as augmentation to courses.
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