To operate the Linear MDKP, a user simply enters a PIN followed by the # key, and the code is transmitted to the receiver for validation. The MDKP can be mounted on either a wall or a gooseneck. The Linear MDKP Exterior Wireless Keypad can transmit a unique signal for each 1-6 digit PIN code entered.
It was made specifically for a Linear garage door opener. It was very easy to set up and use. My experience with the "universal" keypads is - they won't work.