A 3-key up-down-OK membrane matrix array keypad is a type of keypad that is used to input data or control a device. It consists of a 1x3 array of keys, with one key labeled "up", one key labeled "down", and one key labeled "OK".

The 3-key up-down-OK membrane matrix array keypad is a compact and easy-to-use input device that is often used in a variety of applications, including electronic devices, control systems, and more. It is typically connected to a microcontroller or other control system, which reads the key presses and takes appropriate action based on the input.

The 3-key up-down-OK membrane matrix array keypad is a convenient and cost-effective solution for adding basic input capabilities to a device or system. It is often used in a variety of applications where an up/down/OK input is required, such as in control systems or electronic devices.

This membrane contains 3 keys indicating Up, Down and Select.