The Extron MMK 1 is a mullion mount kit specifically designed for the TLS 525M. It allows the touchpanel to be mounted securely on the vertical frame that separates a door opening from the adjacent glass wall. From outside the room, the mount has an aesthetic appearance to blend in with the design of the TLS panel and mullion frame. The LED lights on the TLS 525M are fully visible on either side of the panel.