his keypad consists of five keys arranged in a row, with each key corresponding to a different color. The colors you mentioned (red, yellow, yellow, yellow, green) indicate the colors of the keys on the keypad.

A membrane keypad is a type of input device that consists of a flexible sheet with conductive traces on it. When a user presses one of the keys on the keypad, the conductive trace corresponding to that key is pressed against another conductive layer, completing an electrical circuit and signaling to the device that the key has been pressed. Membrane keypads are often used in electronic devices where a compact, low-cost input solution is required. They are durable, easy to clean, and resistant to contamination, making them well-suited for use in a wide range of applications.

This is a rectangular capacitive membrame keyboard without markings or text.