Our company has a very aging security system and we finally ran out of our supply of proximity cards. In somewhat of a panic, I searched the Internet and came across ID Enhancements. I placed a call, and got super helpful and friendly Samantha on the line. We talked about our need, and she suggested these cards, but to start with a sample card first to see if it would work with our system. She mailed one out, we tried it, it worked perfectly. Can't say enough good things about the company, the cards we purchased, and Samantha. She is an excellent representative for your company. She's extremely knowledgeable, very helpful and is willing to go the extra mile to help. Thank you!