How to adjust the bightness of the back light?

In the bottom row of keys, there's one to the right of the space bar that has an icon on it that looks like the sun. It's between the Function key (FN) and the Control key (Ctrl). According to the user's manual which came with the keyboard, tapping that key will turn the light on or off. For a "breathing light" (cycle between bright and dim), hold down the FN key and tap the sun icon. Release the FN key, and the light will cycle, from bright to dim to bright to dim etc. - the so-called "breathing light" (I don't use it, as I find it distracting). To simply change the brightness level, hold down the FN key and tap the PU key (Page Up) to brighten the light, or tap PD (Page Down) to dim it. When you have the brightness you want, release the FN key. Works for me ... maybe make a note of it?

what are the dimensions of each key?

Most keys are 5/8" square (16 mm). Judge the large keys from this.

Since seller did not send manual and a reviewer explained fn key, anyone knows what keys ps, sl , pb and pu are for ?

PS - Print Screen SL - Scroll Lock PB - Pause/Break PU - Page Up

does the keyboard light have a time out?

The light is on unless you turn off your computer, put your computer to sleep or there is a key on the keyboard that lets you choose to have the light off.

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🔠 Light up your typing game with clarity and comfort!

SEE EVERY KEY CLEARLY - 4X larger fonts make typing effortless, perfect for professionals who demand clarity and speed.
PLUG PLAY SIMPLICITY - USB wired connection with broad OS compatibility means zero setup hassle—just connect and conquer.
ILLUMINATE YOUR WORKFLOW - Customizable white LED backlighting ensures productivity even in dim environments—no more missed keystrokes.
BUILT TO LAST SPILL RESISTANT - Durable spill-proof design protects your investment from accidental coffee or water mishaps.
ERGONOMIC COMFORT FOR LONG HOURS - Adjustable feet reduce hand fatigue, supporting marathon work or gaming sessions with ease.

The KOPJIPPOM Large Print Backlit Keyboard combines 4X larger key fonts with adjustable white LED backlighting, ergonomic design, and spill-proof durability. Compatible with Windows and Mac OS, this full-size USB wired keyboard offers plug-and-play convenience and is engineered for professionals seeking enhanced visibility, comfort, and reliability in any lighting condition.

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Brand	KOPJIPPOM
Product Dimensions	44.6 x 16 x 2.5 cm; 690 g
Manufacturer	KOPJIPPOM
Color	black
Power Source	USB
Hardware Platform	Laptop
Operating System	mac
Are Batteries Included	No
Item Weight	690 g

Large Print Backlit Keyboard, Silent USB Wired Computer Keyboard, Full Size Keyboard with White Illuminated LED Compatible for Windows, Mac OS Desktop, Laptop, PC, Gaming, Black

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