The Grayhill 82-601-89 Lightable Modular Keyboard series provides a flexible solution for creating custom keyboards. These modules are designed to stack, ensuring consistent button spacing regardless of the number of modules used. They offer a choice of circuitries and are user legendable, allowing for tailored functionality and appearance. Lamp replacement is simplified with options for mounting from the front or back of the circuit board, minimizing disruption to the keyboard assembly. The modules are suitable for a range of industrial applications requiring custom keyboard interfaces.