• Fully programmable keys + 5 additional gaming keys with on-the-fly macro recording
• Individually backlit keys with improved lighting
• Easy access media keys for convenient volume control and media playback
• Mechanical key architecture with distinct tactile feel and faster response
• 10 key rollover for extreme anti-ghosting

Official Commercial Video from Razer :

Razer BlackWidow Chroma – Feel the Difference
The Razer BlackWidow mechanical gaming keyboard was first launched in 2010 and quickly became the most popular and highest selling gaming keyboard worldwide, making its mark as the primary choice for eSports athletes.

World’s First Mechanical Switch Designed For Gaming
Four years later, the Razer Mechanical Switch was introduced, giving the Razer BlackWidow an even greater advantage with the world’s first mechanical switch designed from the ground up specifically for gaming. This enabled gamers to take their skill to the next level with more speed and precision than ever before. By redefining the limits of performance, this elite mechanical gaming keyboard left the competition in the dust, even faster than before.

Color it Up
Now with Chroma customizable backlighting, this gaming icon is raising the bar once again by introducing individually controlled multi-color backlit keys that allow for extreme customization. Bearing the distinct Razer BlackWidow design, the Razer BlackWidow Chroma gives you the unbridled freedom to truly express yourself, not just with an impressive spectrum of colors but with personalized lighting controls as well.

All-new Razer Mechanical Switches
Designed from the ground up specifically for gaming, the all-new Razer Mechanical Switches have an optimized set of actuation and reset points that improve your gaming performance by giving you speed and responsiveness like never before.

Inter-device color synchronization
Whether it’s your favorite shade of green or your guild colors, Chroma gives you the freedom to decide. It could be one, three or even thirty-seven colors, with a spectrum of visual effects featuring 16.8 million colors; the possibilities are whatever you can imagine. With inter-device color synchronization, your Razer Chroma enabled Razer gaming weapons will always go together perfectly.

Greater durability
No matter how intense your gaming marathons get, each Razer Mechanical Switch is engineered to withstand up to 60 million keystrokes, so you’ll enjoy the Razer advantage for longer.

Razer Chroma SDK
All Razer Chroma enabled devices come with an open SDK that will allow game developers to take advantage of the multitude of lighting options available for Chroma by integrating these advanced lighting effects to create in-game lighting alerts or actions per minute lighting features.

Chroma backlighting with 16.8 million customizable color options
The Razer BlackWidow Chroma features individually programmable backlit keys with 16.8 million color options, all easily set through Razer Synapse. From preloaded lighting effects for different types of games, to your own custom uniquely programmed palette of colors, you can effortlessly enhance your gaming experience in a way that is unique only to you.

Custom lighting controls via Razer Synapse
Razer Synapse is a cutting-edge, intuitive software that functions as the Razer BlackWidow Chroma’s brain. Sync your personal lighting settings – ranging from Spectrum Cycling, Breathing, Custom, Preloaded Templates, Reactive, or Wave – automatically with this unified cloud-based configurator.

Available Style :
* Razer BlackWidow Chroma Mechanical Gaming Keyboard
* Razer BlackWidow Expert Mechanical Gaming Keyboard
* Razer BlackWidow Stealth Edition Expert Mechanical Gaming Keyboard
* Razer BlackWidow Tournament Edition Essential Mechanical Gaming Keyboard
* Razer BlackWidow Tournament Edition Stealth Keyboard
* Razer BlackWidow Ultimate Elite Mechanical Gaming Keyboard
* Razer BlackWidow Ultimate MAC Elite Mechanical Gaming Keyboard
* Razer BlackWidow Ultimate Stealth Edition Elite Mechanical Gaming Keyboard

More detailed and purchasing information : Razer BlackWidow Chroma Mechanical Gaming Keyboard

Helpful Customer Reviews :
“New (Orange) switches are much smoother & quieter! (Blackwidow Tournament Stealth 2014 edition) :
I’ve owned several different mechanical switch keyboards and have been experimenting with the various different switch types (Red, Green, Blue, etc.), and had settled on Brown (Blackwidow Tournament Stealth 2013 edition) with Blue O-Rings added as the best I was going to get (includes Razer Synapse macro engine, couldn’t find any other mechanical kb’s with built in macro engines). I was really pleased to see Razer adding a new Orange switch in their 2014 lineup (basically same as brown but better). The new Orange switches are immediately noticeably smooth, quieter, yet still provide a tactile bump. I like the direction Razer is going … I hope they can continue to shorten the key strokes a bit (avoiding the need to add O-Rings perhaps) for those preferring that.

I only wish Razer would create a “Short” (more ergonomic) version (BlackWidow Tournament Stealth) form factor that has full backlighting like the more full sized keyboard models ….. since the BlackWidow Tournament Stealth and its sisters have only a few backlit keys, I instead installed LED strip lighting under my desk to light my keyboard … pretty awesome for now but hopefully they will add more backlighting options in future.

A few helpful links re: mechanical switch types:
http://en.wikipedia.org/wiki/Cherry_MX#Cherry_switches

And a table:
Switch type Clicky Tactile Actuation force
Cherry MX Black No No 60 cN
Cherry MX Red No No 45 cN
Cherry MX Brown No Yes 45 cN
Cherry MX Clear No Yes 65 cN
Cherry MX Blue Yes Yes 60 cN
Cherry MX White Yes Yes 50 cN / 80 cN
Cherry MX Green Yes Yes 80 cN
Razer Green Yes Yes 50g = 50cN; 50% stroke length
Razer Orange No Yes 45g = 45 cN; 50% stroke length — Amazonian”

“Durable, solid keyboard with excellent lighting features and great tactility. :
This is a great mechanical keyboard. The switches are light and have a good tactile response, allowing you to type quickly and with conviction. This thing is a workhorse. I use it for programming several hours each day. The fact that you can customize each individual key’s color makes this keyboard ideal for a large number of applications. I used to own one of the original BlackWidow keyboards and while that was also a great keyboard, this one is even better. The Synapse driver software saves your lighting, mapping and macro configurations to your Razer account. This does require you to log in once, but that’s about all you have to do. You can of course save and load your configuration without having internet access. You just need internet access to download the driver and register for an account, that’s it. This keyboard has made typing much more ergonomic, enjoyable and efficient. Worth every penny. — Blake M. Rodriguez”

More detailed and purchasing information : Razer BlackWidow Chroma Mechanical Gaming Keyboard