Is the cord really 66ft long?

The cord is 2 meters long which is approximately 6.6 ft. https://www.calculateme.com/length/meters/to-feet/2

Does this computer have protrusions so you can fell where the home keys are? I can't tell if the images are renders or photos.

Yes, it does have the standard home key guides.

Is this particular model compatible with Mac?

I have yet to see a modern PC keyboard FULLY compatible with the Mac. Fully compatible means that keys work during startup so you can boot into safe mode, switch to a different drive, reinstall the operating system, run disk utility, reset PRAM, etc. I was burned when I bought a "fully" Mac-compatible keyboard that wasn't. Now I must keep an Apple keyboard nearby for startup tasks.

Should I buy this keyboard or a keyboard like the Corsair K70?

I had a K95 RGB that bit the dust, IMO backlighting is a toy that's a bit overrated. (Something for me to fiddle with when I'm bored, but more an indication of needing to get outside instead of sitting around some more in front of a computer). Also I looked up trying to fix a water-damaged Corsair, what a nightmare. I ended up buying this Das keyboard from my local MicroCenter, same price, and could just pick it up and take it home. They also offer a no-questions-asked warranty, which in my use-case (I love coffee and will typically drink it in the early morning while I work at the keyboard) is really important! Lastly the Corsair isn't nearly as solid-feeling as this unit is. For a similar price, this Das 4 Professional has a great volume knob (the Corsair's is an awkward 'roller' that I never used). I never used the Corsair's programmable function keys (may be of interest to gamers but not for me). Also Corsair's software for lighting (iCue) was enormous - believe it or not, it is 456MB large! Insane - this keyboard needs no software, it is plug-and-play, immediately recognized by W10 and I'm told is fine for Linux as well.

Compatible Devices	ノートパソコン, パソコン
Color Name	ソフトな触感 - Cherry MXブラウンスイッチ。
Item Shape	usb-a。
Batteries Included	No
Batteries Required	No
Brand	Das Keyboard
Manufacturer	Das Keyboard
Item Model Number	DASK4MKPROSIL
Included Components	USBケーブル
Operating System	Linux
Special Features	USBハブ, メディアコントロール
Connectivity Technology	USB, USB 2.0, USB 3.0
Size	Professional w/ USB 3 Hub
Material	アルミニウム
Product Dimensions	45.72 x 17.27 x 3.3 cm; 1.3 kg
Item Weight	1.3 kg

Dasキーボード4プロのソフト触覚MXブラウンメカニカルキーボード（DASK4MKPROSIL）

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