The Ideazon Merc Stealth USB Human Interface Device refers to a USB-based peripheral device, commonly a keyboard, produced by Ideazon (which was later acquired by SteelSeries). This device is notable for its specialized gaming keypad design, often including additional keys or functionality intended for gamers.

The term Human Interface Device (HID) is a broad classification for input devices such as keyboards, mice, and game controllers. In the context of the Merc Stealth, this means the device uses standard HID protocols to communicate with the operating system (OS), making it compatible with a wide range of systems without requiring special drivers for basic functionality.