USB Dome Button

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USB Dome Button

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Downloads: Key Configurator 2.12.

The “USB Dome Button” is a palm switch with a large mushroom dome. It connects to a workstation or PC via a USB cable. A press on the button sends a keystroke (or a mouse button click) to the workstation. You can configure which keystroke that is. You can use the USB Dome Button to perform any command on the workstation: launch a presentation, start a show, pause or resume playback, function as a “Quiz Buzzer”, or any other action.

The dome is available in several colours.

The USB Dome Button is recognized by the PC as a “keyboard” —with only a single key. Microsoft Windows (and other operating systems) have intrinsic support for these devices. The USB Dome Button runs out of the box, no driver is needed (on tablets with a USB “On-The-Go” connection, an adapter-cable is needed). The button is fully compatible with “Game Show Presenter” and similar applications (see also the application note).

CE & FCC compliant
USB Large Dome Button


The USB Dome Button is a robust “emergency switch”-style button, for indoor and outdoor use. The sealing USB connector allows for splash-proof cable connection. Cables are available up to 4.5 metres. A “debounce” circuit avoids false triggering and an ESD protection filter on the USB input guarantees a reliable operation.

As mentioned above, the PC or workstation recognizes the USB Dome Button as a keyboard with one key. The key to transmit to the PC is configured via a free configuration utility, see the Downloads section. In addition to standard keys, that utility also allows you to configure a few extended functions, such as to function as a “play/pause” button on a remote control, or as a mouse button. By default, the USB Dome Button transmits the keyboard key “1”.

In addition to single-key transmissions, the USB Dome Button supports “macro commands” which allow to transmit a sequence of key strokes to the PC, including key combinations with “Alt”, “Ctrl” or “GUI” shift modifiers. With a macro, a press on the button can start an application or open a web browser on a specific URL.

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Mounted on a microphone stand
Mounted on a microphone stand

Multiple Dome Buttons may be attached to a PC at the same time, with each Dome Button (typically) configured to transmit a different key code.

The base of the button has two holes of Ø5.2mm for mounting the button on a table or wall. For a temporary fixation (mobile use), the button also has a threaded insert for camera screws (1/4"-20 UNC); this allows the button to be fitted on a camera tripod or on a microphone stand. (Heavy duty tripods often use 3/8" screws instead of 1/4", but adapters to go from one thread size to the other are available.)


Dimensions   Base: 85 × 85 mm, height: 45 mm, dome diameter: 94 mm; total height: 101 mm.
Colour   Base: black & grey; dome: red, black, green, yellow or white.
Mechanical lifetime   > 106 operations
Mechanical mounting   Two 5.2mm mounting holes (semi-permanent mounting); 1/4"-20 UNC threaded insert (temporary mounting).
Operating temperature   -25 °C to +40 °C.
Degree of protection   IEC/EN 60529: IP65
Actuation force   20 to 25 N.
USB connector   Mini-B, buccaneer (sealed IP68).
USB interface/profile   USB “HID”, keyboard profile, configurable key code.
Power supply   Powered through the USB connection.
Debounce criterion   20 ms stable period.
Switch latency   50 ms maximum, 35 ms average.
Illumination   Option: 12 high-brightness low-power LEDs.

Accessories and variants

Black Dome Button
Black Dome Button
Yellow Dome Button
Yellow Dome Button
Green Dome Button
Green Dome Button
White Dome Button
White Dome Button
Illuminated dome, e.g. for Quiz Buzzers
Illuminated dome, e.g. for Quiz Buzzers
Cable with sealing connector, in lengths of 2 metres, 3 metres or 4.5 metres
Cable with sealing connector, in lengths of 2 metres, 3 metres or 4.5 metres
<br/>Key Configuration utility

Key Configuration utility

Application notes

KeyConfigurator Usage Guide
The guide to using the KeyConfigurator utility, to program the USB Dome Buttons, USB Pushbuttons and Wireless Dome Buttons to a key or key sequence.
USB Buttons as Quiz Buzzers
This application note describes how to use the USB buttons as quiz buzzers, with specific focus on the illuminated buttons.


Key Configurator utility
The KeyConfigurator utility it the utility for programming the USB Dome Buttons, USB Pushbuttons and Wireless Dome Buttons to a key or key sequence.
See also the Usage Guide.
  Microsoft Windows         Version 2.12      
  Apple macOS         Version 2.9      
  Linux         Version 2.12      

Button Lights utility
For buttons with LED illumination, you need this utility to control and configure the illumination. This utility can be used stand-alone or in combination with quiz master software.
  Microsoft Windows         Version 1.7      

The Software Development Kit for the “usbhid” devices (which includes these USB Dome Buttons). This programmer's library allows you to switch button illumination on and off under control of your own software. This SDK provides interfaces for C/C++, C# and VB.Net, for 32-bit and 64-bit software (Linux is 64-bit only). Documentation is included.
  Microsoft Windows
  Version 1.7      

USB Dome Button Specifications
  All systems           PDF file