The K1 is where Keychron started. It went to Kickstarter in October 2018 as the Keytron, a low-profile wireless keyboard laid out for Macs, and was renamed the K1. An aluminum frame keeps it rigid, and early boards are only 18 mm tall. They came as an 87-key TKL or a 104-key full-size. Versions 1 to 3 used house-brand low-profile switches and Bluetooth 3.0. Version 4 arrived in mid-2020 with low-profile Gateron switches, Bluetooth 5.1 and new cylindrical keycaps. Version 5 added a hot-swappable low-profile Keychron Optical option, and Version 6 in 2024 brought QMK. Low-profile switches are shorter than regular ones, and Keychron gives 2.5 mm of total travel for its low-profile red against 4 mm for a normal switch, so the K1 types closer to a laptop. They won't swap with standard MX switches, and the 2000 mAh battery is half the size of the K2's.
Versions
Versions 1 to 3 used house-brand low-profile switches and Bluetooth 3.0, and early boards came as an 87-key TKL or a 104-key full-size. Version 4 (mid-2020) moved to low-profile Gateron switches and Bluetooth 5.1. Version 5 offered soldered low-profile Gateron or hot-swappable low-profile Keychron Optical switches, and the K1 SE added a hot-swappable low-profile Gateron option. Version 6 (2024) adds QMK and Keychron's low-profile Milk POM switches. Low-profile switches don't fit regular MX boards, and the K1 Pro and K1 Max are different keyboards.
The flat ABS keycaps get slick and shiny with use, and the early versions run on Bluetooth 3.0. Keychron says its light low-profile switches can fire when you rest a finger on them, which some heavy typists dislike.
New to used keyboards? How to check a used keyboard covers chatter, stabilizers, keycap shine and the rest in detail.
Buying guide
We'd buy the Version 4 TKL with Red switches at $46 delivered from a 100% seller, since Version 4 brought Gateron switches and Bluetooth 5.1. There are at least 37 for sale, and most used boards from US sellers ask $35–65 delivered, while Japan dealers ask $158–292, which is what pushes the band up to $55–200. Early K1s run on Bluetooth 3.0 and came as an 87-key TKL or a 104-key full-size, so trust the version only from the title or the box, and check the photos for a numpad if you want one. The low-profile switches won't swap with regular MX ones and the flat ABS caps are hard to match, so look for shine and missing caps, and ask for a keyboardtester.com video with every key. Ask how many days a charge lasts with the backlight off, since the 2000 mAh battery is half the size of the K2's.
$22.02est. delivered
The lowest ask, a K1 with Red switches at $22 delivered with no bids yet, so expect it to climb. The photo shows only the box, so ask for a photo of the board and its version, and we'd stop near $46, where the Version 4 below asks.
Keychron K1 Red switches
$46.02est. delivered
A Version 4 TKL with Red switches at $46 delivered from a 100% seller, under the band. Version 4 is the one with Gateron switches and Bluetooth 5.1, so ask for a typing test and how many days a charge lasts.
Keychron K1 Bluetooth Mechanical Keyboard V4 TKL 80% RGB Backlit Red Switches
$60.20est. delivered
Titled tested and working, a 104-key board with the numpad at $60 delivered from a 100% seller. The version isn't named, so ask for a photo of the box or label to see whether it's an early Bluetooth 3.0 board.
Keychron K1 Mechanical Keyboard 104 Keys RGB Bluetooth USB-C - Tested & Working
Delivered prices include shipping as eBay quoted it to a US address on Oct 14, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.
Snapshot
Checked . Some may have sold.
Delivered prices include shipping as eBay quoted it to a US address on Oct 14, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.
Used$22.02est. delivered
$10.00 + $12.02 shipping
Auction · no bids yet · ends in 6d 16h
Good buy
Red switches. Auction with no bids, and the photo shows only the box.
Seller: thedappersaurus
100% positive
Used$46.02est. delivered
$39.99 + $6.03 shipping
Buy It Now$39.99
This seller takes offers, and many sellers accept less than the asking price.
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Good buy
Version 4 TKL with Red switches and RGB.
Seller: jcyoda
100% positive
Used$60.20est. delivered
$40.00 + $20.20 shipping
Buy It Now$40.00
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
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Good buy
104-key RGB board titled tested and working.
Seller: mm_sells
100% positive
For parts$62.79est. delivered
$44.99 + $17.80 shipping
Buy It Now$44.99
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Our take
104-key board titled missing the F4 and F5 keys. Asks more than the tested complete one.
Seller: thenighttech
99.9% positive
Open box$109.99delivered
$109.99 · free shipping
Buy It Now$109.99
Our take
Version 6 TKL, the QMK version, with Red switches. Open box, free shipping.
Seller: dailydealz687
99.4% positive
Used$157.70est. delivered
$110.70 + $47.00 shipping
Buy It Now$110.70
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
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Our take
Titled JP layout and tested, shown with box and cable. Ships from Japan.
Seller: risingsungaming
98.1% positive
Used$47.52est. delivered
$40.00 + $7.52 shipping
Buy It Now$40.00
Check the seller
TKL with low-profile Blue switches. Same title as another seller's K1.
Seller: samort7
100% positive
Used$291.80est. delivered
$236.80 + $55.00 shipping
Buy It Now$236.80
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Priced high
Titled Version 5, stock photo, from Japan with $55 shipping. About 2.8 times the median.
Seller: tsumikichi030303.shop
100% positive
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