EM4200 125KHZ KeyFobs (Pack of 100) is a professional access key fob for issuing compact access credentials for regular users. This access key fob is supplied by EM Microelectronic and should be selected with attention to the intended application and any existing equipment or credential standards. For credential products, the most important checks are the technology, format, encoding requirements and compatibility with the access-control system already in use. Key details identified for this item include pack of 100 and 125KHZ frequency, which can help confirm that it matches the buying requirement. If you need help choosing the right option, call our team; we bring more than 20 years of experience in identification, access control and workplace technology.