Skip to content
Redragon PENUMBRA K687

Redragon PENUMBRA K687

By Redragon · Mechanical Keyboards · Home & Workspace · More from Redragon

  • 75% layout, 81 keys
  • Tri-mode: Bluetooth/2.4GHz/wired
  • CNC aluminum board, 1.8 kg
  • 5-layer noise dampening
  • Dimensions 13.15 x 5.51 x 1.69 in

Price not listed

New
Used, refurbished, open-box

Stores are listed in a fixed order, never by price or commission. Prices are snapshots. Check the current price with the store.

Problems, parts and running costs

Summary

A heavy, full-CNC-aluminum 75% mechanical keyboard with gasket mounting, tri-mode wireless, a control knob and PBT gradient keycaps for $59.99 direct with discount codes. Check the key legends before you buy: they are transparent and printed on the front face of the keys, making them hard to read without the backlight on.

Strengths

  • Solid 1.8 kg CNC aluminum chassis that feels heavy and stable on the desk.
  • Gasket mount and five-layer dampening deliver a smooth, soft, satisfying typing sound and feel.
  • Tri-mode connectivity makes switching between wired, 2.4 GHz, and multiple Bluetooth devices straightforward.
  • Hot-swappable sockets accept almost all 3-pin and 5-pin mechanical switches.
  • Includes PBT gradient keycaps, a control knob, per-key RGB, and side lighting out of the box.
  • Two-year limited warranty when bought new from Redragon’s official store.

Weaknesses

  • Transparent key legends are printed on the front face of the keycaps, making them hard to read when the backlight is off.
  • There are no adjustable or flip-out feet, leaving the board at a fixed rear typing angle despite marketing claims of height adjustability.
  • Battery capacity and polling rate specs are completely unpublished.
  • An independent reviewer reported difficulty finding a constant-on backlight setting, as lighting effects remained animated.
  • Software and packaging contain minor spelling and grammar errors.
  • Long-term durability and component reliability remain unverified due to a thin review pool.

Verified specifications

Layout75% layout, 81 keys, US QWERTY, ANSI, full N-key rollover.
Connectivitytri-mode — USB-C wired, 2.4 GHz wireless, and Bluetooth (3.0 and 5.0) supporting up to 3 devices via FN+1/2/3.
Switchespre-lubed custom Hi-Fi linear switches, hot-swappable with 3-pin and 5-pin switches.
Mount and dampeninggasket mount with 5 layers — 3.5 mm PO foam, IXPE switch foam, PET sound pad, bottom socket foam, and a silicone bottom pad plus silicone gasket.
Knobsingle rotary knob controlling backlight brightness and media functions (volume, play/pause, track).
BacklightRGB backlighting with side lighting and 16+ preset patterns.
SoftwareWindows software for macros, keybindings, and lighting control; macOS supported via a physical mode switch on the rear.
Battery and polling ratebattery capacity and polling rate are not published by the manufacturer.
Dimensions13.15 × 5.51 × 1.69 in (manufacturer) or 43 × 132 × 43 mm (KeebFinder).
Weight1.8 kg (1800 g).
Case and keycapsCNC aluminum case with a frosted finish; PBT gradient keycaps.
In the boxkeyboard, 4 spare switches, 2.4 GHz receiver, detachable USB-C cable, and user manual.
Warranty2-year limited warranty for new products purchased from Redragonshop.com.
Full research notes and sources

Build, sound and feel

The gasket mount and five layers of internal dampening absorb harsh bottom-outs, producing a soft, muted acoustic profile rather than a hollow plastic clack. The frosted CNC aluminum finish resists fingerprints well and keeps the board firmly anchored during rapid typing or gaming sessions.

The primary physical drawback is the lack of tilt legs. The rear height is fixed, which may require a wrist rest depending on your preference.

Connectivity and software

Tri-mode wireless lets you pair up to three Bluetooth devices, plug in the 2.4 GHz dongle for a responsive gaming connection, or use USB-C wired mode. Redragon provides Windows software for custom macros, key remapping, and lighting control, while Mac users can switch modes using the physical toggle switch at the rear. Reviewers and owners note that connecting via cable or dongle is reliable, though initial setup requires paying attention to the mode switch and shortcuts.

Repairs, parts and running costs

The hot-swappable sockets support standard 3-pin and 5-pin switches, making switch replacement straightforward. The box includes four spare switches, and the detachable USB-C cable can be replaced with any standard cable. Redragon does not publish a spare parts catalog or a battery replacement procedure for the internal cell. There are no mandatory subscriptions or consumables, keeping ongoing ownership costs at zero unless you choose to buy custom keycaps or aftermarket switches.

Is it worth it?

At the $59.99 direct price using discount codes (such as GHOST15 for 15% off and KEEBFINDER for 10% off), the K687 PRO is strong value for an all-aluminum gasket-mounted board with PBT keycaps and hot-swap sockets. At the independent review price of $89.99, value drops because the unpublished battery life and fixed typing angle become harder to overlook. If you do not need wireless connectivity, Redragon’s wired K687 sibling offers an alternative at $69.

Which model this is

This page covers the Redragon PENUMBRA K687 PRO, model K687 PRO (SKU RED-K687-R34GBK), released in 2024. Do not confuse it with the wired-only Redragon PENUMBRA K687 released in 2025, or the separate Redragon PENUMBRA K687 HE magnetic-switch variant.

Sources

Manufacturer:

Independent reviews:

Owner reports:

Buying guides for this category

Compare with

See also

Related products