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BTXETUEL SayoDevice OSU O3C Rapid Trigger Hall Switches Magnetic Linear Switches Keyboard with Knob and Screen,Copy Paste,Shotcut,Macro Hotswap Mini Keypad.… | Geometry Dash OSU Rhythm Games,with Knob and Screen,Copy Paste,Shotcut,Macro Hotswap Mini Keypad
BTXETUEL

BTXETUEL SayoDevice OSU O3C Rapid Trigger Hall Switches Magnetic Linear Switches Keyboard

Bottom line: The BTXETUEL SayoDevice OSU O3C Rapid Trigger Hall Switches Magnetic ($29.59 on Amazon as of 2026-10-07): Three Hall effect magnetic switches with rapid trigger for fast repeat taps; main trade-off: only three keys, so it supplements rather than replaces a full keyboard.

$29.59

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Buy on Amazon — $29.59 Compare to similar gaming peripherals

By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For keyboards, mice, headsets and other PC peripherals, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

*Price sourced from Amazon.com. Last updated 2026-10-07. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ Three Hall effect magnetic switches with rapid trigger for fast repeat taps
  • ✓ 8000Hz USB 2.0 polling over Type-C for low-latency input
  • ✓ 0.96-inch 160x80 IPS color screen shows key range and press counts
  • ✓ Assignable knob maps to volume, song scrolling, or any key
  • ✓ Hotswap sockets take any Hall magnetic switch, one-click recalibration

Cons

  • ✗ Only three keys, so it supplements rather than replaces a full keyboard
  • ✗ Requires calibration on first use and after each firmware update
  • ✗ Screen is small at 0.96 inches, limiting what it can display
  • ✗ Only the first screen line is customizable, not the whole display

Manufacturer description

The BTXETUEL SayoDevice OSU O3C is a three-key magnetic keypad built for rhythm games, where a single missed input ends a run. Its three Hall effect linear switches support rapid trigger actuation and report over USB 2.0 Type-C at an 8000Hz polling rate, so repeated taps in osu!, Geometry Dash, and other timing-critical titles register without the debounce delay of mechanical contacts. A 0.96-inch IPS color screen at 160x80 resolution sits above the keys, showing live key range and press counts, and the first line of text is customizable if you want your player ID on it. The knob is fully…

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SpecPicks Verdict

SpecPicks scored BTXETUEL SayoDevice OSU O3C Rapid Trigger Hall Switches Magnetic… using a rating × review-volume × price-fit model applied to published specs and reviews across the gaming peripherals category. BTXETUEL's gaming peripherals lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for gaming peripherals of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

What is the polling rate on the SayoDevice O3C?

It reports at 8000Hz over a USB 2.0 Type-C connection, which is the rate listed by the manufacturer for this keypad.

Can I replace the switches?

Yes. The board is hotswap and supports any Hall magnetic switch. After swapping, a single click runs the calibration routine.

Does it work for games other than osu!?

It is marketed for osu!, Geometry Dash, and other rhythm games, and the keys and knob also accept macros, shortcuts, and copy-paste bindings for general desktop use.

What can the screen display?

The 0.96-inch IPS color screen runs at 160x80 resolution and shows the visible key range and button counts. The first line of text is user-customizable, such as your player ID.

Is it actually good, based on buyer feedback?

Buyer feedback is overwhelmingly positive.

Key Features

  • 【O3C OSU SayoDevice Keyboard】This keyboard with 3 Hall magnetic linear switches, 1 knob, 1 screen! TYPE-C,USB 2.0 high-speed 8000HZ.
  • 【Replaceable Switches】Supports any Hall magnetic Switches, with a simple click for calibration.
  • 【IPS color Screen】With 0.96 inch IPS color screen,160*80 Resolution, visible key range and button counting.
  • 【Custom Screen】The first line of text on the screen can be customized, such as writing your own ID.
  • 【Custom Knob】The knob can also be set with any key, such as to scroll through the song list.
  • 【NOTICE】Sometimes, the keyboard needs to do "CALIBRATION" ( The steps are shown in the figure ) before use for the first time or after firmware upgrade.

Full Specifications

BrandBTXETUEL
Colorwhite
StyleGame
Model NameO3C OSU SayoDevice Keyboard
Style NameGame
Unit Count1 Count
Switch TypeLinear
ConnectivityUSB
Model NumberSayodevice-O3C
Power SourceCorded Electric
Series Number3
Built-In Media'3 Hall magnetic linear switches', '1 knob', '1 screen'
Number of Keys3
Button Quantity3
Keyboard LayoutQWERTY
Mfr Part NumberSayoDeviceO3C
Special FeatureMagnetic
Antenna LocationGaming
Hand OrientationAmbidextrous
Compatible DevicesLaptop, Mac, PC
Full listing titleBTXETUEL SayoDevice OSU O3C Rapid Trigger Hall Switches Magnetic Linear Switches Keyboard with Knob and Screen,Copy Paste,Shotcut,Macro Hotswap Mini Keypad.… | Geometry Dash OSU Rhythm Games,with Knob and Screen,Copy Paste,Shotcut,Macro Hotswap Mini Keypad

Ready to buy?

BTXETUEL SayoDevice OSU O3C Rapid Trigger Hall Switches Magnetic Linear Switches Keyboard with Knob and Screen,Copy Paste,Shotcut,Macro Hotswap Mini Keypad.… | Geometry Dash OSU Rhythm Games,with Knob and Screen,Copy Paste,Shotcut,Macro Hotswap Mini Keypad is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $29.59

*Price sourced from Amazon.com. Last updated 2026-10-07. Price and availability subject to change.

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BTXETUEL SayoDevice OSU O3C Rapid Trigger Hall Switches Magnetic Linear Switches Keyboard with Knob and Screen,Copy Paste,Shotcut,Macro Hotswap Mini Keypad.… | Geometry Dash OSU Rhythm Games,with Knob and Screen,Copy Paste,Shotcut,Macro Hotswap Mini Keypad
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