The DS keypad is unfortunately now discontinued and no longer available for purchase. If you have an existing DS keypad it can integrate with many different brands of door strike as long as it is a DC powered strike and uses a “Normally Open” contact closure. With that being said we would recommend Rutherford Controls for your door strike manufacturer. They make quality products and have been successfully integrated many times into our system. You can reach their website here http://www.rutherfordcontrols.com to review their door strike options.