The 87BB3-201 is a 16-button matrix keypad module featuring a 4×4 button configuration with snap-dome contact system for reliable actuation and tactile feedback. The module maintains a low-profile design with square buttons measuring 0.366 ± 0.010 inches and a button projection of 0.015 ± 0.010 inches, ensuring compact integration into control panels and devices. Each button is rated for up to 3,000,000 operations, providing long-term durability and reliability. The keypad supports customizable legends through insertable legend cards, dry transfer options, or molded-in legends for production quantities. Terminal pins are positioned at the bottom of each switch with square terminals measuring 0.025 ± 0.002 inches, and the module dimensions are 2.000 ± 0.010 inches in both horizontal and vertical directions. This keypad is ideal for industrial control systems, medical devices, telecommunications equipment, and consumer electronics requiring robust, tactile input interfaces.