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    • ThockyDeep · resonant
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    • PoppyCrisp · popping
    • TactileBumpy · two-beat
    • MarblyBouncy · round
    • MahjongSharp · tile-like

    Same Sounds · Switches Sound Lab

    Shop by Sound now spans keyboards + switches

    • Thocky switches5
    • Creamy switches13
    • Clacky switches3
    • Marbly switches1
    • Poppy switches4
    • Silent switches8
    Hear every switch in the Sound Lab.
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    Hall Effect · competitive precision

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    Crafted to click right. · 6 series

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    • GX SeriesGaming over-ear · output audio1
    • GE SeriesGaming in-ear · low latency · footstep clarityComing

    GX over-ear / GE in-ear, paired. Gaming-focused, not audiophile.

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    HE keyboards + gaming mice + GX headsets + GE earbuds — one desktop sound.

    Enter the Gaming Ecosystem Perfect Stop · timing mini-game
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    • ThockyDeep · resonant
    • CreamySmooth · buttery
    • ClackyBright · snappy
    • MarblyBouncy · rich
    • PoppyCrisp · popping
    • SilentQuiet · subtle

    Switches · By Feel

    Secondary filter

    • Linear15
    • Tactile10
    • Silent8
    • Magnetic / HE1
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    Keycaps · Series New

    Four series

    • IconSignature everyday designs
    • PlayNovelty · character
    • JellyTranslucent · jelly
    • × CollabArtist / IP · limited

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    Secondary filter

    • Cherry Profile8
    • PBT12
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EPOMAKER
  • Home
  • Keyboards

    Sound-Tuned Series

    • Signature — Flagship Line
    • Epoch SeriesEndgame flagship
    • Maker SeriesCreate & DIY
    • Lab SeriesExperiments & new forms
    • Core — Value Line
    • TH SeriesYour first great sound
    • Galaxy SeriesAluminum resonance
    • RT SeriesRetro looks
    • Luma SeriesLow-profile & portable
    • HE SeriesCompetitive magnetics

    Shop Scene

    • Gaming
    • Office/WFH
    • Coding
    • Design
    • Desk Setups
    • Travel & Commute
    • First Keyboard
    • Gift Guides

    Keyboard Sizes

    • 100% - Full Size
    • 96% - 1800 Layout
    • 80% - TKL / Tenkeyless
    • 75% - Compact TKL
    • 70% - No Dedicated F-Row
    • 65% - Compact
    • 60% - Portable
    • 20% - Macropad

    Shop by Layout New

    By keyboard layout & regional version

    • ANSI · US56
    • ISO-DE · German7
    • ISO-FR · French2
    • ISO-ES · Spanish3
    • ISO-UK · British1
    • JIS · Japanese5
    Smart AI Advisor Find your Perfect Match Browse All Keyboards
  • Shop by Sound

    Pick a signature

    • ThockyDeep · resonant
    • CreamySmooth · buttery
    • SilentQuiet · subtle
    • ClickyCrisp · tactile
    • ClackyBright · snappy
    • PoppyCrisp · popping
    • TactileBumpy · two-beat
    • MarblyBouncy · round
    • MahjongSharp · tile-like

    Same Sounds · Switches Sound Lab

    Shop by Sound now spans keyboards + switches

    • Thocky switches5
    • Creamy switches13
    • Clacky switches3
    • Marbly switches1
    • Poppy switches4
    • Silent switches8
    Hear every switch in the Sound Lab.
  • Gaming

    Gaming Keyboards

    Hall Effect · competitive precision

    • HE SeriesHall Effect switches
    • Hall EffectRapid trigger
    • Inductive / TMRAnalog

    Gaming Mice Series

    Crafted to click right. · 6 series

    • Available
    • CarbonCarbon-fiber flagship · Carbonis / CarbonX2
    • ClickMainstream gaming · Click / Click Lite2
    • NexNex Pro / Nex Lite2
    • Coming
    • EM SeriesNew lineSoon
    • Ergo SeriesErgonomicPlanned
    • Maker SeriesCreative / experimentalPlanned

    Gaming Audio New

    Crafted to sound right. · output

    • Headsets
    • GX SeriesGaming over-ear · output audio1
    • GE SeriesGaming in-ear · low latency · footstep clarityComing

    GX over-ear / GE in-ear, paired. Gaming-focused, not audiophile.

    Gaming Ecosystem

    One setup. One sound.

    HE keyboards + gaming mice + GX headsets + GE earbuds — one desktop sound.

    Enter the Gaming Ecosystem Perfect Stop · timing mini-game
  • Accessories

    Switches · By Sound Sound Lab

    • ThockyDeep · resonant
    • CreamySmooth · buttery
    • ClackyBright · snappy
    • MarblyBouncy · rich
    • PoppyCrisp · popping
    • SilentQuiet · subtle

    Switches · By Feel

    Secondary filter

    • Linear15
    • Tactile10
    • Silent8
    • Magnetic / HE1
    • Switch Testers

    Keycaps · Series New

    Four series

    • IconSignature everyday designs
    • PlayNovelty · character
    • JellyTranslucent · jelly
    • × CollabArtist / IP · limited

    Keycaps · By Profile

    Secondary filter

    • Cherry Profile8
    • PBT12
    • MDA / XDA / SA
    • OEM / MAO / MOA
    • ISO Layout5
    • More
    • Deskmats
    • Cables & More
    • Bundles
  • About

    Our Brand

    • About EPOMAKER
    • Awards
    • Contact Us
    • Sound Lab
    • Maker Community
    • Newsroom
    • Announcements
    • Guides
    • Reviews

    Events

    • EFAE 2026 · Hong Kong
    • TKX 2026 · Tokyo
    • TGS 2026 · Chiba
    • IFA 2026 · Berlin
    • Gamescom 2026 · Cologne
    • All Events & Exhibitions

    Programs

    • Affiliate Program
    • Student Discount
    • Distribution Growth
    • New Product Ambassador
    • Reward Program
    • All Programs
    Smart AI Advisor. Find your Match. Explore the Maker Community
  • Downloads
    • Manuals
    • Software
    • Firmware
    • VIA JSON
    hub.epomaker.com
  • Support

    Help center

    • Warranty
    • Returns & Replacements
    • Shipping
    • Track Order
    • FAQ
    • Contact Us
  • AI Product Recommendation
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Feker JJK21 Manual
Manuals

Feker JJK21 Manual

Freya TongNov 15, 20221 min read
    Manual for JJK21 numpads.
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    Crafted to sound right. EPOMAKER makes keyboards, switches and keycaps — plus gaming mice and headsets — every board tuned in our own Sound Lab.

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