The 86BB2-004 is a standard 3x4 keypad from Grayhill's Series 86 line, designed for unsealed, flange-mounted applications with 0.5-inch button centers. It features snap-dome contacts that provide positive tactile feedback and supports both top surface and sub-surface mounting configurations. The keypad is available with matrix code or single pole/common bus circuitry options, and offers multiple legend choices including molded-in and insertable legend options for customization. With its compact dimensions (2.690 inches height, 1.990 inches width) and robust construction, the 86BB2-004 is well-suited for industrial control panels, telecommunications equipment, and consumer electronics requiring reliable numeric input interfaces.